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Fast step heterodyne light-induced thermoelastic spectroscopy gas sensing based on a quartz tuning fork with high-frequency of 100 kHz 认领 引用 被引量：4
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作者 Yuanzhi Wang Ying He +4 位作者 Shunda Qiao Xiaonan Liu Chu Zhang Xiaoming Duan Yufei Ma 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2026年第1期36-48,共13页
In this paper,a fast step heterodyne light-induced thermoelastic spectroscopy(SH-LITES)sensor using a high-frequency quartz tuning fork(QTF)with resonant frequency of~100 kHz is reported for the first time.The theoret... In this paper,a fast step heterodyne light-induced thermoelastic spectroscopy(SH-LITES)sensor using a high-frequency quartz tuning fork(QTF)with resonant frequency of~100 kHz is reported for the first time.The theoretical principle of heterodyne LITES(H-LITES)signal generation is analyzed firstly,and an acetylene(C2H2)H-LITES sensor is established to verify its performance.Experimental comparisons between the high-frequency QTF and a standard commercial QTF with resonant frequency of~32.768 kHz reveal that the high-frequency QTF exhibits a tenfold faster response time.Specifically,the H-LITES sensor with this QTF achieves a 33 ms measurement cycle,90%shorter than commercial counterparts.Furthermore,The SH-LITES technique is proposed to further shorten the scanning time to 15 ms,which achieves the shortest LITES measurement time known to date.To demonstrate its advantages in dynamic gas detection,an H2O-LITES system integrating both QTF types is constructed for real-time monitoring of H2O concentration during different respiration patterns.Comparative measurements show that the SH-LITES more accurately captures dynamic H2O concentration fluctuations during respiration,outperforming the commercial QTF-based H-LITES sensor in rapid response scenarios. 展开更多
关键词 fast heterodyne light-induced thermoelastic spectroscopy(H-LITES) high-frequency quartz tuning fork(QTF) step heterodyne light-induced thermoelastic spectroscopy(SH-LITES) respiration detection
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Commissioning of a radiofrequency quadrupole cooler‑buncher for collinear laser spectroscopy 认领 引用 被引量：2
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作者 Yin‑Shen Liu Han‑Rui Hu +15 位作者 Xiao‑Fei Yang Wen‑Cong Mei Yang‑Fan Guo Zhou Yan Shao‑Jie Chen Shi‑Wei Bai Shu‑Jing Wang Yong‑Chao Liu Peng Zhang Dong‑Yang Chen Yan‑Lin Ye Qi‑Te Li Jie Yang Stephan Malbrunot‑Ettenauer Simon Lechner Carina Kanitz 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第1期193-201,共9页
A RadioFrequency Quadrupole(RFQ)cooler-buncher system was developed and implemented in a collinear laser spectroscopy setup.This system converts a continuous ion beam into short bunches while enhancing the beam qualit... A RadioFrequency Quadrupole(RFQ)cooler-buncher system was developed and implemented in a collinear laser spectroscopy setup.This system converts a continuous ion beam into short bunches while enhancing the beam quality and reducing the energy spread.The functionality of the RFQ cooler buncher was verified through offline tests with stable rubidium and indium beams delivered from a surface ion source and a laser ablation ion source,respectively.Bunched ion beams with a full width at half maximum of approximately 2μs in the time-of-flight spectrum were successfully achieved with a transmission efficiency exceeding 60%.The implementation of the RFQ cooler-buncher system also significantly improved the overall transmission efficiency of the collinear laser spectroscopy setup. 展开更多
关键词 Radiofrequency quadrupole cooler-buncher Collinear laser spectroscopy Hyperfine structure Time of flight
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Functional near-infrared spectroscopy:Systematic mapping of abnormal brain function features in neurological disorders 认领 引用 被引量：1
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作者 Yunjie Li Yangyang Feng +6 位作者 Xia Liu Ruochao Yuan Shiling Chen Jingyi Wang Chao Pan Gaigai Li Zhouping Tang 《Neural Regeneration Research》 SCIE CAS CSCD 2026年第10期4506-4522,共17页
Functional near-infrared spectroscopy quantifies cerebral hemodynamic signals by capturing oxygenation-dependent changes in hemoglobin in a noninvasive,portable,and ecologically valid manner,providing a unique insight... Functional near-infrared spectroscopy quantifies cerebral hemodynamic signals by capturing oxygenation-dependent changes in hemoglobin in a noninvasive,portable,and ecologically valid manner,providing a unique insight into neurovascular coupling.However,functional imaging biomarkers with high ecological validity for neurological disorders such as stroke,Parkinson's disease,dementia,amyotrophic lateral sclerosis,epilepsy,spinal cord injury,and traumatic brain injury are lacking,limiting the mechanistic understanding,treatment evaluations,and individualized interventions.The aim of this review is to systematically summarize evidence from the past decade on the use of functional near-infrared spectroscopy under the aforementioned conditions,synthesize its value for revealing neural mechanisms and assessing therapeutic responses,and identify current technical bottlenecks and future directions for advancement.Collectively,the findings demonstrate that functional near-infrared spectroscopy possesses substantial and far-reaching potential for uncovering the neural mechanisms underlying disease and for evaluating treatment-induced changes in brain function.Equipped with wearable probes,functional near-infrared spectroscopy can continuously and noninvasively monitor brain activity in naturalistic environments for extended periods,thereby overcoming the limitations of conventional imaging modalities that can only acquire data under restricted settings.This capability can furnish unprecedented objective neuroimaging evidence for neuroregenerative therapy research.Moreover,the portability of functional near-infrared spectroscopy allows it to be integrated into neurofeedback training systems:hemoglobin signals can be fed back to participants within milliseconds,enabling targeted,individualized,closed-loop modulation of brain function and considerably expanding the scope of hemodynamicsbased neurofeedback.When combined with other brain function assays(such as electroencephalography)and intervention techniques(such as transcranial magnetic stimulation and transcranial direct current stimulation),functional near-infrared spectroscopy also supplies high-temporal-resolution hemodynamic information,laying a critical foundation for the construction of high-precision noninvasive brain–computer interfaces,real-time cognitivestate decoding,and adaptive neuromodulation.Admittedly,almost all existing functional near-infrared spectroscopy studies are still observational and have small sample sizes,short follow-ups,and insufficient controls—shortcomings that together produce low-grade evidence.Therefore,there is still a significant gap before clinical translation can be achieved.Technically,the limited penetration depth of functional near-infrared spectroscopy restricts sampling to the superficial cortex,leaving deep nuclei largely unreachable.In addition,no consensus exists across devices regarding optode layout,light-source choice,motion-artifact correction,or analytical pipelines,creating pronounced heterogeneity that undermines reproducibility.With artificial intelligence and big data analytics advancing rapidly,functional near-infrared spectroscopy embedded within multimodal fusion frameworks is now poised to systematically map aberrant brain function signatures of neurological disorders,identify pathological regions suitable for targeted intervention,and provide real-time assessments of functional changes produced by neuroregenerative therapies. 展开更多
关键词 biomarkers brain mapping clinical translational application functional connectivity functional near-infrared spectroscopy multimodal fusion nervous system diseases neuroimaging neuroregenerative therapy neurovascular coupling
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Structural and spectroscopic properties of Yb:Al-P co-doped silica fiber preform materials 认领 引用
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作者 Roman Sajzew Martin Leich +5 位作者 Florian Lindner Jörg Bierlich Jan Dellith Lothar Wondraczek Matthias Jäger Katrin Wondraczek 《Advanced Photonics Nexus》 CSCD 2026年第2期177-187,共11页
We demonstrate a pathway for producing large-core fiber preforms with optimized characteristics for high-power fiber laser applications.Reactive powder sintering(REPUSIL)was used for producing large volumes of doped s... We demonstrate a pathway for producing large-core fiber preforms with optimized characteristics for high-power fiber laser applications.Reactive powder sintering(REPUSIL)was used for producing large volumes of doped silica fiber preforms with predictable,homogeneous,and precise compositional profiles,focusing on formulations near the equimolar dopant ratio of P:Al=1 to suppress Yb-related photodarkening(PD).Spectroscopic and structural properties are related to PD performance for both preform and optical fiber materials.All preform samples exhibit a radial dip-free,step-like refractive index profile with relative average index fluctuations of less than 2%.Reduced excess PD loss of 10 dB∕m after 21 h exposure time and lower PD rates are obtained when the P content is adapted at a slight excess over Al,even when the overall Al content is high. 展开更多
关键词 optics photonics laser ytterbia alumina phosphorus fiber REPUSIL powder technology photodarkening fluorescence spectroscopy Raman spectroscopy UV-Vis spectroscopy
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Tender energy spectroscopy beamline at the Shanghai Synchrotron Radiation Facility 认领 引用
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作者 Shu‑Min Yang Ling‑Ling Guo +12 位作者 Bing Nan Ying Zhao Yan‑Qing Wu Zhi Guo Chen Tian Bo Zhao Chao‑Fan Xue Jun Zhao Shuang Song Zhen‑Ye Liang Li‑Na Li Yong Wang Ren‑Zhong Tai 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第1期94-106,共13页
This paper describes the design and performance of the tender energy spectroscopy beamline(BL16U1),a phase Ⅱ beamline,at the Shanghai Synchrotron Radiation Facility.The beamline,based on an in-vacuum undulator source... This paper describes the design and performance of the tender energy spectroscopy beamline(BL16U1),a phase Ⅱ beamline,at the Shanghai Synchrotron Radiation Facility.The beamline,based on an in-vacuum undulator source with 26 mm period,provides an operable energy range between 2.1 keV and 16 keV,covering the K-edges of P to Rb and L3-edges of Zr to Bi.The principal optical elements of the beamline are a toroidal mirror,a liquid nitrogen-cooled double-crystal monochromator,a high-harmonic-rejection mirror,and two pairs of Kirkpatrick–Baez(KB)mirrors.Three end-stations,including non-focusing,microprobe,and sub-microprobe types,are installed on the beamline.X-ray fluorescence(XRF)and X-ray absorption spectroscopy(XAS),including X-ray absorption near-edge structure(XANES)and extended X-ray absorption fine structure(EXAFS),are performed under vacuum or He atmosphere at the non-focusing end-station(with a beam spot size of∼670μm×710μm).Using two KB mirrors systems,micro-XRF(μXRF)mapping and micro-XANES(μXANES)studies can be performed with a spot size of approximately∼3.3μm×1.3μm at the microprobe end-station and with a smaller spot size of∼0.5μm×0.25μm at the sub-microprobe end-station.The non-focusing end-station was officially opened to users in January 2024.The microprobe and sub-microprobe end-stations will be opened to users in the near future.This paper presents the characteristics,short-term technical developments,and early experimental results of this new beamline. 展开更多
关键词 Tender energy X-ray spectroscopy X-ray fluorescence SSRF X-ray absorption spectroscopy(XAS) Microprobe
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Multi-point scanning Raman spectroscopy analysis of evolution of carbon structure and inherent minerals of metallurgical coke during heating process 认领 引用
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作者 Ya-Qi Gao Chong Zou +2 位作者 Yuan She Zheng-Yan Huang Jia-Yao Qin 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第6期380-396,共17页
The complexity of the internal environment of a blast furnace has limited the exploration of the microscopic reaction mechanisms of metallurgical coke.Some of the traditional detection methods often focus on average v... The complexity of the internal environment of a blast furnace has limited the exploration of the microscopic reaction mechanisms of metallurgical coke.Some of the traditional detection methods often focus on average value,neglecting the structural heterogeneity of coke.The changes of coke in a CO2 atmosphere at temperatures ranging from 1000 to 1500℃ were investigated using multi-point micro-Raman spectroscopy.The results indicate that,with the increasing temperature,the defect-related parameters of two tested samples decreased by 63.8%and 39.2%,respectively.The interlayer spacing of graphite and the thickness of microcrystalline stacking demonstrate a linear correlation with the Raman defect index,thus offering a precise approach for monitoring the graphitization process.Surface scanning micro-Raman spectroscopy indicated that minerals experienced dynamic migration,which was characterized by an“increase-decrease-increase”pattern.Moreover,in comparison with single-point detection,the quantity of surface scanning sampling increased.Simultaneously,the variance rose from 0.097 to 0.499,which reflects the authenticity of the samples.Finally,the changes of carbon structure and inherent mineral content and distribution are visually revealed by mapping method.This method effectively provides a high-resolution microstructural scale for the quality evaluation of blast furnace coke. 展开更多
关键词 Blast furnace Micro-Raman spectroscopy Coke Mineral Mapping
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Evaluation of animal corneal stroma as a human model:A raman spectroscopic analysis of biochemical composition 认领 引用
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作者 Yaohua Zhang Yong Li +9 位作者 Zexian Zhao Lin Shi Shengsheng Wei Ming Han Zhe Yu Xirui Su Jing Du Jing Li Qi Zeng Xueli Chen 《Journal of Innovative Optical Health Sciences》 SCIE EI CSCD 2026年第4期140-150,共11页
Comparative studies of human and animal corneal structures using Raman spectroscopy are limited.We compared the Raman spectra of human and animal corneal stroma to evaluate the suitability of animal corneas as experim... Comparative studies of human and animal corneal structures using Raman spectroscopy are limited.We compared the Raman spectra of human and animal corneal stroma to evaluate the suitability of animal corneas as experimental models and to assess the feasibility of Raman spectroscopy for characterizing biochemical differences.Raman microspectroscopy(700–4000 cm-1)was performed on seven fresh porcine corneas,six fresh rabbit corneas,and 12 human corneal stromal lenticules obtained from patients who underwent small incision lenticule extraction.Four machine learning algorithms—Support Vector Machine(SVM),K-Nearest Neighbors(KNN),Random Forest(RF),and Decision Tree(DT)—were used to classify the data.Ten characteristic peaks were identified in the human corneal stroma,including prominent peaks at 937 cm-1(proline/valineype I collagen),1243 cm-1(collagen amide III),1448 cm-1(collagen/phospholipids),1663 cm-1(DNA/proteins),2940 cm-1(lipids/proteins),and 3330 cm-1(water).Eleven peaks were observed in the porcine and rabbit corneas.Using raw spectra,the SVM,KNN,and RF models achieved 100%classification accuracy(area under the receiver operating characteristic(ROC)curve,1.00 for both test and validation sets).The DT model showed the lowest performance(approximately 33%accuracy for human data;[area under the ROC curve,0.67 ftest setg]).Human myopic corneal stroma differed from the animal models in regions linked to nucleic acids and water content.The porcine cornea more closely resembled the human cornea than the rabbit cornea,indicating it as a more appropriate analog.Raman spectroscopy is a useful tool for interspecies comparisons and elucidating the biochemical composition of diseased corneas. 展开更多
关键词 Models animal corneal stroma myopia spectrum analysis Raman spectroscopy
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In situ Raman spectroscopy monitoring of interface aging in aluminum-filled polydimethylsiloxane composites 认领 引用
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作者 Yiming Luo Yuan Liu +8 位作者 Huiling Feng Hui Liang Junda Shen Yingxue Diao Yuanchao Liu Xiaoliang Zeng Zhenwei Yu Rong Sun Binbin Zhou 《Nano Materials Science》 EI CAS CSCD 2026年第2期491-498,共8页
The increasing power density of chips poses a significant challenge in the form of material aging for aluminumfilled polydimethylsiloxane(Al/PDMS)composites,which are widely used in thermal interface materials.Despite... The increasing power density of chips poses a significant challenge in the form of material aging for aluminumfilled polydimethylsiloxane(Al/PDMS)composites,which are widely used in thermal interface materials.Despite the growing importance of this issue,the specific mechanisms behind the interfacial aging process remain elusive,hindering a comprehensive grasp of the aging dynamics in these composites.In our research,we have developed an in-situ Raman aging monitoring system that leverages the non-contact and high-resolution capabilities of Raman spectroscopy to study the interface aging process.Our findings indicate a notable decrease in the intensity of the Raman peak as further cross-linking of the molecules during aging,with the most pronounced decline occurring at the interface between aluminum and PDMS.This insight could potentially elucidate why the interface in composite materials is frequently the site of failure during aging.Our study offers a versatile methodology for investigating the interfacial aging of polymer composites,contributing to a broader understanding of the interface behavior in composite materials at the molecular level. 展开更多
关键词 Interface aging Polymer composites In situ Raman spectroscopy
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Phonons at functional oxide interfaces:An in situ sum-frequency spectroscopic perspective 认领 引用
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作者 Shiyu Zhang Junjie Dong +1 位作者 Tongying Liu Wei-Tao Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第6期490-500,共11页
Functional oxides host emergent interfacial phenomena from superconductivity to catalysis,intimately tied to lattice phonons that mediate many-body interactions.Sum-frequency generation(SFG)spectroscopy,a second-order... Functional oxides host emergent interfacial phenomena from superconductivity to catalysis,intimately tied to lattice phonons that mediate many-body interactions.Sum-frequency generation(SFG)spectroscopy,a second-order nonlinear optical technique with intrinsic surface specificity,enables in situ and operando probing of lattice vibrations at surfaces and interfaces.In this review,we introduce the basic theory of SFG and survey its application in investigating functional oxide surfaces and interfaces—tracking oxygen vacancies on anatase TiO2,unveiling electron–phonon coupling modulation in LaAlO3/SrTiO3 heterostructures,and detecting polaronic signatures in Nb-doped SrTiO3—thereby offering microscopic insights into the physics of oxide interfaces. 展开更多
关键词 sum frequency spectroscopy oxide interfaces interfacial phonons polarons
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Optical properties of five-layer and ten-layer CrI3films under high pressure:Insights from in situ Raman and UV-visible spectroscopy 认领 引用
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作者 Zhipeng Yan Xiaodong Yao +5 位作者 Guangyang Dai Chenkai Li Qunfei Zheng Jun Han Ying Liu Xiaowei Sun 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第5期125-131,共7页
The two-dimensional van der Waals ferromagnetic semiconductor CrI3provides an ideal platform for exploring the interplay among structural,electronic and magnetic degrees of freedom.In this work,we systematically in... The two-dimensional van der Waals ferromagnetic semiconductor CrI3provides an ideal platform for exploring the interplay among structural,electronic and magnetic degrees of freedom.In this work,we systematically investigate the thickness-dependent optical properties of five-layer and ten-layer CrI3under hydrostatic pressure up to 27.9 GPa by in situ Raman and UV-visible absorption spectroscopy.All AgRaman modes exhibit a continuous blueshift with increasing pressure.The low-frequency modes(Ag1-Ag3)are mainly associated with enhanced interlayer coupling,whereas the highfrequency modes(Ag4-Ag6)reflect the suppression of surface vibrations.The Raman modes disappear at approximately4.9 GPa for the five-layer sample and 11.2 GPa for the ten-layer sample,indicating a stronger strain sensitivity in thinner CrI3.Optical absorption measurements show a pronounced redshift of the absorption edge,accompanied by bandgap narrowing from 2.26 eV to 1.26 eV in five-layer CrI3.At comparable pressures,the five-layer sample consistently exhibits a wider bandgap than the ten-layer one,which is attributed to quantum confinement effects and reduced interlayer hybridization.Above 12.7 GPa,the bandgap reduction becomes less pronounced,probably due to enhanced Cr 3d/I 5p orbital overlap and strengthened superexchange interactions.These results reveal a clear layer-dependent structure-electronic coupling in CrI3under compression and provide useful insights into pressure modulation of van der Waals magnetic semiconductors. 展开更多
关键词 a few layered CrI3 Raman spectroscopy UV–vis absorption spectrum high pressure
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Real-time impedance spectroscopy of lithium-ion batteries via composite current pulses 认领 引用
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作者 Yue Yang Tongfang Fu +4 位作者 Wenbin Li Paul Thiele Chenye Song Simon Mertes Stefan Pischinger 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第6期902-914,I0021,共13页
Conventional sinusoidal electrochemical impedance spectroscopy is often impractical for real-time control or on-board diagnostics because measurements at low frequencies require long dwell time,resulting in lengthy te... Conventional sinusoidal electrochemical impedance spectroscopy is often impractical for real-time control or on-board diagnostics because measurements at low frequencies require long dwell time,resulting in lengthy test duration.To address this issue,the composite current pulse excitation is implemented in this work for real-time impedance spectrum acquisition,using the discrete Fourier transform.Pulse sequences and sampling conditions are designed to balance bandwidth and accuracy of the impedance results while satisfying hardware constraints and system relaxation requirements.To improve repeatability under noise and dynamic operating conditions,outliers are mitigated by introducing truncated singular value decomposition reconstruction.Two pulse widths(1 and 100 ms)are applied to overcome the bandwidth limitation of a single-width excitation,enabling an accurate spectrum across 1 k Hz to 1 Hz within~1 s.On a commercial 18650 lithium-ion battery,a mean relative impedance deviation of 2.1%compared with galvanostatic electrochemical impedance spectroscopy results is achieved across state of charge from 5%to 90%at 10 and 25℃.Time-domain voltage simulations using pulse-calibrated parameters reproduce the measured dynamic responses,achieving accuracy comparable to simulations parameterized from galvanostatic electrochemical impedance spectroscopy. 展开更多
关键词 Real-time impedance measurement Current pulse Electrochemical impedance spectroscopy Lithium-ion batteries
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Electronic structure and superconducting gap of HgBa2Ca2Cu3O8+δrevealed by laserbased angle-resolved photoemission spectroscopy 认领 引用
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作者 Taimin Miao Wenshan Hong +18 位作者 Qinghong Wang Shanshan Zhang Bo Liang Wenpei Zhu Neng Cai Mingkai Xu Shenjin Zhang Fengfeng Zhang Feng Yang Zhimin Wang Qinjun Peng Zuyan Xu Hanqing Mao Zhihai Zhu Xintong Li Guodong Liu Lin Zhao Yuan Li X.J.Zhou 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第2期257-263,共7页
The spatially-resolved laser-based high resolution angle resolved photoemission spectroscopy(ARPES)measurements have been performed on the optimally-doped HgBa2Ca2Cu3O8+δ(Hg1223)superconductor with a T_(c... The spatially-resolved laser-based high resolution angle resolved photoemission spectroscopy(ARPES)measurements have been performed on the optimally-doped HgBa2Ca2Cu3O8+δ(Hg1223)superconductor with a Tc of 133 K.Two distinct regions are identified on the cleaved surface:the single Fermi surface region where only one Fermi surface is observed,and the double Fermi surface region where two Fermi surface sheets are resolved coming from both the inner(IP)and outer(OP)CuO2 planes.The electronic structure and superconducting gap are measured on both of these two regions.In both cases,the observed electronic states are mainly concentrated near the nodal region.The momentum dependence of the superconducting gap deviates from the standard d-wave form.These results indicate that the surface electronic structure of Hg1223 behaves more like that of underdoped cuprates. 展开更多
关键词 cuprate angle resolved photoemission spectroscopy(ARPES)
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Fast three-dimensional NMR spectroscopy reconstruction based on Hankel matrix with two-directional sliding windows 认领 引用
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作者 Tianyu Qiu Hao Fu +1 位作者 Xiaobo Qu Di Guo 《Magnetic Resonance Letters》 EI CAS 2026年第3期1-13,共13页
Nuclear magnetic resonance(NMR)spectroscopy has grown into a formidable tool in biomedical analysis and quantification.However,the lengthy acquisition for highdimensional NMR spectroscopy hinders its broader applicati... Nuclear magnetic resonance(NMR)spectroscopy has grown into a formidable tool in biomedical analysis and quantification.However,the lengthy acquisition for highdimensional NMR spectroscopy hinders its broader applications.Non-uniform sampling(NUS)effectively reduces the acquisition time by acquiring partial data.Therefore,the need for reconstruction methods is motivated.The low-rank block Hankel matrix reconstruction method achieves notable reconstruction,but requiring prolonged computational time.In this work,a novel two-directional sliding window method is proposed to reduce the size of the low-rank matrix,effectively mitigating the computational time.Incorporating the parallel computation,further acceleration can be achieved.The numerical experiments on synthetic and real NMR spectroscopy illustrate that,among compared approaches,the proposed method accomplishes reconstruction in the shortest time without compromising the spectral quality. 展开更多
关键词 NMR spectroscopy Reconstruction Hankel matrix Low-rank Sliding window
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In situ exploration of oxygen electrocatalysis using core-shell nanostructure-enhanced Raman spectroscopy 认领 引用
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作者 Zhengxin Qian Jishuang Zeng +5 位作者 Sen Zhao Qingna Zheng Jinghua Tian Qingchi Xu Hua Zhang Jianfeng Li 《Nano Materials Science》 EI CAS CSCD 2026年第4期873-885,共13页
Advancements in fuel cells and water electrolyzers have significantly bolstered the utilization of hydrogen energy.Notably,the oxidation and reduction processes of oxygen at the electrode—termed oxygen evolution reac... Advancements in fuel cells and water electrolyzers have significantly bolstered the utilization of hydrogen energy.Notably,the oxidation and reduction processes of oxygen at the electrode—termed oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)—manifest sluggish reaction kinetics,thus requiring noble metals as catalysts,which considerably impedes system efficiency and cost.The imperative for enhancing reaction rates and diminishing overpotential necessitates the development of effective catalysts,which strongly depends on the mechanistic understanding of these reactions at the molecular level.Therefore,this review summarizes our recent efforts in utilizing in situ enhanced Raman spectroscopy,especially the borrowing surface-enhanced Raman spectroscopy(SERS)strategy,shell-isolated nanoparticle-enhanced Raman spectroscopy(SHINERS),and the SHINERS-satellite strategy,to capture oxygen intermediate species as a bridge to investigate the molecular mechanisms of OER and ORR.Combining in situ SERS with other characterization techniques and theoretical simulation,the structural evolution of active sites and intermediates,including*OOH,*OH,*OO,etc.,during OER/ORR has been monitored under reaction conditions,and the reaction mechanisms together with structureactivity correlations have been identified at the molecular level.These findings may provide a pivotal scientific foundation towards the discovery of better materials for electrochemical hydrogen energy. 展开更多
关键词 Surface-enhanced Raman spectroscopy Oxygen evolutioneduction reaction Reaction mechanism In-situ characterization Core-shell nanostructures
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Exploring the thermal evolution of highly-to over-mature source rocks using Raman spectroscopy and geochemical signatures 认领 引用
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作者 Fu-hua Shang Xiao-peng Sun +3 位作者 Shu-wei Ma Yu-tong Pang Guan-qun Zhou Ke Miao 《China Geology》 CAS CSCD 2026年第1期75-85,共11页
This study investigated the heterogeneous responses of organic matter(OM)in highly-to over-mature source rocks during thermal maturation.An integrated analysis was conducted on the Raman spectroscopic and geochemical ... This study investigated the heterogeneous responses of organic matter(OM)in highly-to over-mature source rocks during thermal maturation.An integrated analysis was conducted on the Raman spectroscopic and geochemical signatures of shales from the Lower Silurian Longmaxi Formation and the Lower Cambrian Qiongzhusi Formation,as well as anthracites from the Lower Permian Shanxi–Formation and the Upper Carboniferous Taiyuan Formation(collectively referred to as the Shanxi Taiyuan Formations).Additionally,burial and thermal evolution modeling was employed to support the analysis.A systematic assessment of Raman spectral parameters(e.g.,the positions and intensity ratio of the D and G bands)revealed robust correlations between the thermal history patterns of source rocks and molecular structural evolution parameters.The subsequent mechanistic quantification demonstrated that the maturation state of the source rocks was subjected to the hierarchical control of three principal factors:Peak heating temperature,the duration of sustained thermal intensity,and effective maturation duration.In addition,comparative analyses demonstrated that the anthracites attained higher structural ordering under sustained thermal conditions.This contrasts with the disordered carbon matrices observed in the intermittently heated shales.Raman spectroscopy further revealed broader variations in the D and G band intensities of the Longmaxi Formation compared to the Qiongzhusi Formation.This difference is associated with their different thermal histories.The thermal burial histories confirm that shales in the Longmaxi Formation underwent thermal exposure at lower peak temperatures over a shorter duration compared to those in the Qiongzhusi Formation.Finally,this study established a maturity calibration model for over-mature source rocks through a systematic correlation between Raman peak height ratios(RD/G)and vitrinite reflectance(Ro). 展开更多
关键词 Raman spectroscopy Overmature source rock Qiongzhusi Formation Longmaxi Formation Anthracite Mineral exploration engineering
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Experimental Advances on Light Baryon Spectroscopy at BESⅢ Experiment 认领 引用
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作者 Shi Wang Hao Liu +1 位作者 Shuangshi Fang Xiongfei Wang 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第5期9-17,共9页
The BESⅢexperiment is currently the world's only electron-positron collider operating in the tau-charm physical energy region.Since starting data taking in 2009,BESⅢhas accumulated the world's largest data s... The BESⅢexperiment is currently the world's only electron-positron collider operating in the tau-charm physical energy region.Since starting data taking in 2009,BESⅢhas accumulated the world's largest data set in the center-of-mass energy range of 1.84-4.95 GeV,including approximately 10 billion J/ψevents and 3 billionψ(3686)events,together with extensive data on open-charm hadron pair production near threshold regions.These unique datasets,characterized by high statistics and low background,provide unprecedented experimental conditions for studying light baryon spectroscopy.This article systematically reviews the progress made by BESⅢin baryon spectroscopy,with a focus on recent breakthrough achievements,including the discovery of excited nucleon states,A hyperon states,Σhyperon states,Ξhyperon states,andΩ-hyperon states.These results expand the spectrum of baryon excited states and provide crucial experimental support for understanding non-perturbative QCD and resolving the“missing baryon resonances”problem. 展开更多
关键词 BES excited nucleon states light baryon spectroscopy hyperon states data taking electron positron collider
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In situ Raman spectroscopic investigation of copper speciation in hydrothermal fluids at temperatures up to 300℃ 认领 引用 被引量：1
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作者 Zhenglong Wang Linbo Shang +6 位作者 I-Ming Chou Chen Chen Yunhe Zhou Jianguo Li Ziqi Jiang Xinwei Gao Ye Wan 《Acta Geochimica》 EI CAS CSCD 2026年第1期142-154,共13页
The formation of copper deposits is closely related to hydrothermal processes.Understanding the migration of copper in hydrothermal fluids aids in reconstructing mineralization processes and deciphering deposit genesi... The formation of copper deposits is closely related to hydrothermal processes.Understanding the migration of copper in hydrothermal fluids aids in reconstructing mineralization processes and deciphering deposit genesis.Copper primarily exists as Cu+and Cu2+in hydrothermal solutions,with redox conditions governing their interconversion.In chloride-rich geological fluids,Cu-Cl complexes are considered critical for copper transport.However,the specific types and valence transitions of Cu-Cl complexes under varying hydrothermal conditions remain poorly understood.This study employed in situ Raman spectroscopy to systematically analyze Cu+HCl and CuCl2+K2S2O3/H2 systems under saturated vapor pressure at 25-300℃,elucidating the effects of temperature,Cl-concentration,and redox conditions on copper speciation.In the Cu+HCl system,copper dissolved as monovalent Cu-Cl complexes.At high temperatures(>200℃),[CuCl2]-is the dominated species,whereas[CuCl3]2-becomes prevalent at lower temperatures and higher HCl concentrations.For the Cu2+-Cl system,the dominant species transitioned from[Cu(H2O)n]2+(<50℃)to[CuCl4]2-(100℃)and further to[CuCl]+and[CuCl2]0 at 300℃.The introduction of reducing agents(K2S2O3/H2)facilitated Cu2+→Cu+reduction,thereby stabilizing Cu+-Cl complexes and inducing partial copper precipitation.The behavior of copper in chloriderich hydrothermal fluids observed in this study indicates that high-temperature oxidizing fluids facilitate Cu mobilization,while cooling and redox changes promote deposition and ore minerals formation. 展开更多
关键词 Raman spectroscopy In situ analysis Hydrothermal fluids Copper Transport mechanism
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Recent advances in chiral recognition based on surface-enhanced Raman scattering spectroscopy 认领 引用 被引量：1
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作者 Feiyan Ma Haomiao Dou +5 位作者 Danni Luo Ying Yan Jie Zhou Guangda Xu Yue Wang Longshan Zhao 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第4期225-231,共7页
Most bioactive compounds(amino acids,sugars,peptides,proteins)and drugs are chiral.Although the enantiomers have similar physical and chemical properties,they may exhibit completely different physiological effects in ... Most bioactive compounds(amino acids,sugars,peptides,proteins)and drugs are chiral.Although the enantiomers have similar physical and chemical properties,they may exhibit completely different physiological effects in terms of biological activity,toxicity,and pharmacological effects.Therefore,chiral recognition is particularly important in numerous fields.Surface-enhanced Raman scattering(SERS)spectroscopy,a promising nondestructive analytical technique with wide applications in biosensing,food safety,and environmental analysis,exhibits exceptional potential for chiral recognition.However,there remains a notable scarcity of comprehensive reviews focusing on SERS-based chiral recognition.This review introduced the development of SERS and summarized the classification of chiral enantiomers recognition by SERS spectroscopy in detail in the past 10 years,mainly including EM-dominated chiral substrates,chiral ligand-modified systems,charge transfer(CT)-based"chiral-label-free"approaches,and chiral molecularly imprinted strategies.In addition,the potential challenges and prospects in SERS spectroscopy for chiral recognition are proposed,which is expected to effectively guide future research. 展开更多
关键词 Surface-enhanced Raman scattering spectroscopy EM-dominated chiral substrates Chiral ligand-modified systems CT-based“chiral-label-free”approaches Chiral molecularly imprinted strategies
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Dual-comb spectroscopic polarimetry for full Jones matrix retrieval enabled by polarization-controlled pulse sequences 认领 引用
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作者 Hidenori Koresawa Hiroki Kitahama +6 位作者 Shogo Tanimura Eiji Hase Yu Tokizane Akifumi Asahara Takeo Minamikawa Kaoru Minoshima Takeshi Yasui 《Advanced Photonics Nexus》 CSCD 2026年第2期34-45,共12页
Spectroscopic polarimetry(SP)is a valuable technique for evaluating thin films,optical materials,and biological samples by revealing both polarimetric and spectroscopic properties.However,its performance is limited by... Spectroscopic polarimetry(SP)is a valuable technique for evaluating thin films,optical materials,and biological samples by revealing both polarimetric and spectroscopic properties.However,its performance is limited by mechanical instability and slow data acquisition due to polarization modulation.To address this,we combine dual-comb spectroscopic polarimetry(DCSP)with polarization-controlled pulse sequences having distinct polarizations and time delays.This approach enables detailed characterization of a sample's polarization response using the Jones matrix,providing both real and imaginary components as a function of wavelength by simultaneously measuring the optical amplitude and phase spectra in two orthogonal polarizations.This method,termed Jones matrix DCSP(JM-DCSP),allows for accurate analysis of optical elements,with experimental results in good agreement with theoretical predictions.By eliminating the need for mechanical modulation and enabling multiplexed polarization probing,JM-DCSP enhances the precision and utility of SP across a broad spectral range and may be applied to various optical characterization scenarios. 展开更多
关键词 optical comb polarimetry spectroscopy Jones matrix dual-comb spectroscopy
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Strain and ligand effect on the electronic structure of Ni-Fe and Ni-Cu alloys:Exploring charge redistribution from x-ray spectroscopies and the charge compensation model 认领 引用
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作者 Zeel Patel Lu Yao +5 位作者 Zhiqiang Wang Yun Mui Yiu Tsun-Kong Sham Sarah Purdy Jianfeng Zhu Sammynaiken Ramaswami 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第5期11-20,共10页
Nickel-based bimetallic alloys are considered thermally and structurally stable,while also possessing desirable catalytic and magnetic functionalities and being highly abundant and affordable.The electronic structure ... Nickel-based bimetallic alloys are considered thermally and structurally stable,while also possessing desirable catalytic and magnetic functionalities and being highly abundant and affordable.The electronic structure of such alloys is of particular interest from the perspective of atomic size mismatch and elemental crystal structure compatibility.In this study,we utilize x-ray techniques,including x-ray diffraction(XRD),x-ray absorption spectroscopy(XAS),and x-ray photoelectron spectroscopy(XPS),to understand the strain and ligand effects on charge redistribution upon alloying.We investigate the elemental crystal structures for incompatible alloys of Ni(fcc)and Fe(bcc),and the compatible crystal structure of Ni(fcc)and Cu(fcc)for comparison.Emphasis is placed on interpreting the metal 2p XPS binding energy shift in binary alloys,where one element is diluted into the other,based on the framework of strain and ligand effects and the charge compensation model of Watson et al.Of interest are the different“compressibilities”of the 4s and 3d wavefunctions within the Wigner-Seitz volume,VWS,and the volume-strain effect resulting in intra-atomic 4s-3d rehybridizations within the alloy,as well as the chemical intuition of charge transfer based on the ligand effect(electronegativity).These considerations provide perspective on“internal pressure”due to the strain effect and help in understanding the x-ray data and their correlation with the electronic structures and properties of bimetallic alloy systems. 展开更多
关键词 bimetallic alloys strain and ligand effect renormalized atom charge compensation model x-ray spectroscopy Mössbauer spectroscopy
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