Article
Chemistry, Physical
Anne P. Rasmusssen, Henrik B. Pedersen, Lars H. Andersen
Summary: This study utilizes time-resolved action spectroscopy and fs-pump probe scheme in an electrostatic ion-storage ring to investigate the lifetimes of specific vibrational levels in electronically excited states. The results show a significant decrease in lifetime when exciting higher vibrational levels, attributed to the opening of internal conversion over an excited-state energy barrier. These findings provide a new method to uncover small energy barriers in excited-state dynamics.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Cate S. Anstoter, Jan R. R. Verlet
Summary: The study examines the impact of basis set, orbital choice, and geometry on modeling photoelectron angular distributions of molecular anions. Guidelines are provided for chemists to capture the correct chemical physics of anisotropy of photodetachment while managing computational costs for larger molecular anions.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Multidisciplinary Sciences
Abhishek Shahi, Deepak Sharma, Sunil Kumar, Saurabh Mishra, Igor Rahinov, Oded Heber, Daniel Zajfman
Summary: In this study, the radiative cooling of a stored, initially rotationally hot OH- ion beam is investigated using an electrostatic ion beam trap combined with an in-trap velocity map imaging spectrometer. The time-dependent rotational population is directly measured, and the rotational temperatures are estimated and verified using different models.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Rulin Tang, Yuzhu Lu, Hongtao Liu, Chuangang Ning
Summary: The electronic structure of U(-) was investigated using the slow-electron velocity-map imaging method, revealing its electron affinity and excited states. The study provides strong evidence that the transition between the first excited state and the ground state of U(-) is electric dipole (E1) allowed.
Article
Chemistry, Physical
A. Jalehdoost, B. von Issendorff
Summary: Vibrationally resolved photoelectron spectra of anthracene anions were studied in the energy range of 1.13-4.96 eV. The photoemission was mainly due to autodetaching electronically excited states of the anion, resulting in significant changes in vibrational excitation of the neutral molecule. Eight excited states were identified based on observed vibrational patterns, seven of which were known resonances from absorption spectroscopy. Different excited states showed distinct photon energy dependencies of vibrational excitations, suggesting diverse photoemission lifetimes. Surprisingly, some resonances exhibited bimodal distributions of emission lifetimes, possibly due to relaxation processes induced by specific vibrational modes.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Cole R. Sagan, Cate S. Anstoeter, Mushir Thodika, Kenneth D. Wilson, Spiridoula Matsika, Etienne Garand
Summary: The properties of optically allowed electronic states of the tetracene radical anion have been studied using photodetachment yield spectroscopy, and the results have been compared with high-level electronic structure computations, showing that these calculations can accurately describe the energy and lifetime of anion resonances.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Braden M. Weight, Ming Zheng, Sergei Tretiak
Summary: Resonant Raman experiments have revealed the robust tunability of optoelectronic properties in single-walled carbon nanotubes (SWCNTs) with organic sp2 or sp3 hybridization defects. This study employed ab initio simulations to investigate near-resonant Raman spectroscopy in pristine and chemically functionalized SWCNT models, and observed new features that corresponded to experimental observations. By varying the frequency of the external Raman laser near the defect-induced E11* optical transition, the character of these features were determined using a perturbative treatment of the electronic structure.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Ernesto Marceca, Jennifer A. Noble, Claude Dedonder-Lardeux, Christophe Jouvet
Summary: The decarboxylation mechanism of cold monodeprotonated phthalic acid was studied, revealing different fragmentation pathways in the deprotonated anion and in the radical generated upon electron photodetachment. Unlike other aryl carboxylic acids, a double loss of CO2 molecules takes place in the phthalic monoanion, with a statistical distribution of product translational energies at higher excitation energies.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Chemistry, Physical
Yo-ichi Yamamoto, Yoshi-Ichi Suzuki, Toshinori Suzuki
Summary: Charge transfer reactions from I- to solvent water, methanol, and ethanol were investigated using extreme ultraviolet time-resolved photoelectron spectroscopy (EUV-TRPES). This technique overcomes the spectral broadening issue caused by electron inelastic scattering in liquids, allowing for clear observation of the spectral evolution. The changes in peak position, width, and intensity reveal electron detachment and subsequent solvation and thermalization processes. Geminate recombination between detached electrons and iodine atoms is analyzed using a diffusion equation and a kinetic model-based global fitting analysis.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Multidisciplinary Sciences
Wenjin Cao, Hui Wen, Sotiris S. Xantheas, Xue-Bin Wang
Summary: In this study, direct evidence for the presence of a fourth water molecule in hydroxide's primary hydration shell is provided through a combined study using high-resolution cryogenic experimental photoelectron spectroscopy and high-level quantum chemical computations.
Article
Environmental Sciences
Ping Zhou, Zhe Zhao, Guangyuan Wei, Hong-Yuan Huo
Summary: Our study created a simulated lunar regolith spectra database using the Hapke AMSA radiative transfer model. We successfully simulated various parameters, such as spectra, mineral abundance, particle size, and maturity, and found good agreement with measured values. Additionally, we analyzed the mechanism, reliability, and applicability of Lucey's spectral characteristic angle parameter.
Article
Chemistry, Physical
Jemma A. Gibbard, Connor J. Clarke, Jan R. R. Verlet
Summary: Two-dimensional photoelectron spectroscopy using nanosecond and femtosecond lasers was employed to investigate the protoporphyrin IX dianion at photon energies ranging from 1.8 to 4.1 eV. The results revealed the presence of two direct detachment channels, with one potentially attributed to the through-space interaction of unshielded carboxylate groups. Additionally, thermionic emission below the repulsive Coulomb barrier was observed in the nanosecond spectra, originating from monoanions produced via photon-cycling.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
De-hua Wang
Summary: The study reveals that the photodetachment spectra are sensitive to the quantum well size and harmonic frequency, with larger quantum wells resulting in more complex oscillations in the spectra. Additionally, the harmonic frequency significantly impacts the photodetachment spectra.
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
(2021)
Article
Physics, Nuclear
Michael D. Higgins, Chris H. Greene, A. Kievsky, M. Viviani
Summary: This study presents further analysis of the three- and four-neutron systems in the low energy regime using adiabatic hyperspherical methods. The results show no evidence of a 4n resonance at low energy, while the long-range behavior exhibits an attractive universal characteristic in the low-energy regime.
Article
Multidisciplinary Sciences
Kiyou Shibata, Kakeru Kikumasa, Shin Kiyohara, Teruyasu Mizoguchi
Summary: This paper provides a database of simulated carbon K edge core loss spectra, which is useful for analyzing experimental spectra and conducting informatics on organic materials.
Article
Chemistry, Physical
Rabi Chhantyal-Pun, Oliver Welz, John D. Savee, Arkke J. Eskola, Edmond P. F. Lee, Lucy Blacker, Henry R. Hill, Matilda Ashcroft, M. Anwar H. Khan, Guy C. Lloyd-Jones, Louise Evans, Brandon Rotavera, Haifeng Huang, David L. Osborn, Daniel K. W. Mok, John M. Dyke, Dudley E. Shallcross, Carl J. Percival, Andrew J. Orr-Ewing, Craig A. Taatjes
JOURNAL OF PHYSICAL CHEMISTRY A
(2017)
Article
Chemistry, Analytical
Ho-Yi Wong, Melody Yee-Man Wong, Bin Hu, Pui-Kin So, Chi-On Chan, Daniel Kam-Wah Mok, Zhong-Ping Yao
ANALYTICA CHIMICA ACTA
(2018)
Article
Plant Sciences
Shi-jian Xiang, Meng-heng Li, Chi-on Chan, Qun Shen, Si-bao Chen, Bai-chao An, Ailsa Chui-ying Yuen, Wen-feng Wu, Hok-him Tang, Si-wei Cao, Shi-fa Ruan, Zhu-xian Wang, Li-dong Weng, Hong-xia Zhu, Huo-ji Chen, Melody Yee-Man Wong, Yan Zhang, Daniel Kam-wah Mok, Qiang Liu
Article
Multidisciplinary Sciences
Yu-Feng Xing, Da-Qiao Zhou, Jing-Song He, Chun-Shan Wei, Wei-Chao Zhong, Zhi-Yi Han, De-Ti Peng, Mu-Min Shao, Tung-Ting Sham, Daniel Kam-Wah Mok, Chi-On Chan, Guang-Dong Tong
Article
Pharmacology & Pharmacy
Hui-Hui Xiao, Tung-Ting Sham, Chi-On Chan, Meng-Heng Li, Xi Chen, Qing-Chang Wu, Daniel Kam-Wah Mok, Xin-Sheng Yao, Man-Sau Wong
FRONTIERS IN PHARMACOLOGY
(2018)
Article
Physics, Atomic, Molecular & Chemical
Ying-Han Lai, Qian Wu, Pui-Kin So, Daniel Kam-Wah Mok, Chun-Tao Che, Zhong-Ping Yao
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
(2018)
Article
Oncology
Amy P. Chiu, Barbara R. Tschida, Tung-Ting Sham, Lilian H. Lo, Branden S. Moriarity, Xiao-Xiao Li, Regina C. Lo, David E. Hinton, Dewi K. Rowlands, Chi-On Chan, Daniel K. W. Mok, David A. Largaespada, Nadia Warner, Vincent W. Keng
MOLECULAR CANCER RESEARCH
(2019)
Article
Biochemistry & Molecular Biology
Rui Liu, Brandon Dow Chan, Daniel Kam-Wah Mok, Chi-Sing Lee, William Chi-Shing Tai, Sibao Chen
Article
Plant Sciences
Hui-Hui Xiao, Juan Lv, Daniel Mok, Xin-Sheng Yao, Man-Sau Wong, Raymond Cooper
JOURNAL OF NATURAL PRODUCTS
(2019)
Article
Chemistry, Analytical
Chi-on Chan, Xiu-juan Xie, Siu-wai Wan, Gao-li Zhou, Ailsa Chui-ying Yuen, Daniel Kam-wah Mok, Si-bao Chen
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
(2019)
Article
Oncology
Magnolia Muk-Lan Lee, Brandon Dow Chan, Wing-Yan Wong, Zhao Qu, Man-Sum Chan, Tsz-Wing Leung, Yushan Lin, Daniel Kam-Wah Mok, Sibao Chen, William Chi-Shing Tai
FRONTIERS IN ONCOLOGY
(2020)
Article
Biochemistry & Molecular Biology
Wen-Xuan Yu, Hok-Him Tang, Jun-Jie Ye, Hui-Hui Xiao, Chung-Yan Lam, Tim-Fat Shum, Zhi-Kang Sun, Yuan-Zhen Li, Xin-Yu Zang, Wen-Chao Du, Jian-Ping Zhang, Tsz-Hung Kong, Li-Ping Zhou, Jia-Chi Chiou, Chun-Fai Kung, Kam-Wah Mok, Jing Hu, Man-Sau Wong
Summary: This study aimed to identify, synthesize, and evaluate the microbial metabolites of SECO for the treatment of osteoporosis. Nine metabolites were identified and synthesized, and five of them exhibited potential osteogenic effects similar to or better than SECO. The study highlights the role of gut microbiota in forming enterolignans with bone-protective effects and provides new approaches for identifying candidates in osteoporosis treatment.
Article
Chemistry, Physical
Ronald Chow, Daniel K. W. Mok
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2020)
Article
Biochemistry & Molecular Biology
Qiuyue Lv, Yushan Lin, Zhexu Tan, Baoping Jiang, Lijia Xu, Haiqin Ren, William Chi-shing Tai, Chi-on Chan, Chi-sing Lee, Zhengbing Gu, Daniel K. W. Mok, Sibao Chen
Article
Automation & Control Systems
Ze-ying Wu, Zhongda Zeng, Zidan Xiao, Daniel Kam-Wah Mok, Hoiyan Chan
CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS
(2017)
