期刊：
Journal of Physical Chemistry Letters,2023年14(35):7795-7801 ISSN：1948-7185
通讯作者：
Duan, CX;Nejad, A
作者机构：
[Nejad, Arman] Georg August Univ Gottingen, Inst Phys Chem, D-37077 Gottingen, Germany.;[Zhu, Tianxin; Duan, Chuanxi; Li, Xiang; Liu, Yun] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Nejad, Arman] Univ Oxford, Phys & Theoret Chem Lab, South Parks Rd, Oxford OX1 3QZ, England.
通讯机构：
[Nejad, A ] G;[Duan, CX ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;Georg August Univ Gottingen, Inst Phys Chem, D-37077 Gottingen, Germany.;Univ Oxford, Phys & Theoret Chem Lab, South Parks Rd, Oxford OX1 3QZ, England.
摘要：
Building on recent progress in the vibrational spectroscopy of the formic acid trimer, we present the first high-resolution measurements of the jet-cooled laser absorption spectrum of (HCOOH)(3). The spectra of the lowest- and highest-frequency C-O stretching fundamentals are analyzed whereas the third band is not observed, complicated by monomer and dimer absorptions at 1219 cm(-1) (8.2 μm). Vibration-rotation parameters are obtained for the band at 1172.31512(68) cm(-1) whereas the C-O stretch at 1246.33(5) cm(-1) exhibits a significantly larger breadth, allowing only resolution of the coarse PQR structure. Vibrational predissociation can be ruled out, and intramolecular vibrational redistribution mechanisms are discussed, particularly coupling to the concerted proton exchange within the cyclic dimer subunit. Ultimately, the question remains open. The prospects of high-resolution measurements of other trimer bands or isotope substitution experiments, which might assist in revealing the mode-specificity of the underlying broadening mechanisms, are discussed.
作者机构：
[Duan, ChuanXi; Wei, MingZheng] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Kang, HuiPeng; Liu, XiaoJun; Wang, YanLan; Quan, Wei] Chinese Acad Sci, Wuhan Inst Phys & Math, Innovat Acad Precis Measurement Sci & Technol, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China.;[Kang, HuiPeng; Liu, XiaoJun; Wang, YanLan; Quan, Wei] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.;[Chen, Jing] Univ Sci & Technol China, Hefei Natl Res Ctr Phys Sci Microscale, Hefei, Peoples R China.;[Chen, Jing] Univ Sci & Technol China, Sch Phys Sci, Dept Modern Phys, Hefei, Peoples R China.
通讯机构：
[Kang, HP ] C;Chinese Acad Sci, Wuhan Inst Phys & Math, Innovat Acad Precis Measurement Sci & Technol, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China.;Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
摘要：
We report on a theoretical study of nonsequential double ionization (NSDI) of magnesium atoms by circularly polarized intense laser pulses. We introduce a concise model considering the laser-induced dynamic core polarization, which is an often overlooked effect in understanding strong-field double ionization. By tracing back the electron trajectories, we demonstrate how the ionic response to the instantaneous laser field enhances the NSDI probability, which plays a crucial role in circular polarization. Furthermore, we propose a method to extract the ionic polarizability from the ratio of double to single ionization. This scheme can be applied to other polar targets and serves as a potential way to probe nonequilibrium states of strongly driven systems on the subfemtosecond timescale.
摘要：
Jet-cooled rovibrational absorption spectra of SO2-H2O and SO2-D2O complexes have been measured in the v1 symmetric stretching region of SO2 around 1151 cm-1 using a segmented rapid-scan quantum cascade laser spectrometer. The rovibrational spectrum of SO2-D2O has also been measured in the v2 bending region of D2O around 1178 cm-1. The tunneling splittings caused by the internal rotation of the water unit could not be resolved under our experimental conditions. The observed rovibrational transitions for these two complexes are analyzed using a standard A-reduced Watson asymmetric top Hamiltonian, yielding precise molecular constants for the excited vibrational states. The experimental band-origins are 1156.713866(70) cm-1 for SO2-H2O and 1156.819797(66) cm-1 for SO2-D2O in the v1 region of SO2, and 1180.177901(58) cm-1 for SO2-D2O in the v2 region of D2O.
期刊：
Journal of Molecular Spectroscopy,2022年383:111559 ISSN：0022-2852
通讯作者：
Duan, CX
作者机构：
[Liu, Zhuang; Duan, Chuanxi; Li, Xiang; Sun, Yinxin; Pu, Yuanyuan] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Peoples R China.
通讯机构：
[Duan, CX ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Peoples R China.
关键词：
Rovibrational spectrum;
Ar-SO2
;
SO2 dimer
;Tunneling splitting
摘要：
Rovibrational absorption spectra of Ar-SO2 and (SO2)(2 )van der Waals complexes generated in a slit supersonic jet expansion have been recorded in the v1 symmetric stretching region of SO2 monomer using an external-cavity quantum cascade laser. Two vibrational bands for (SO2)(2 )and one for Ar-SO2 are assigned and analyzed. All these vibrational bands are of a/c hybrid type. The observed infrared transitions are fitted together with previous radio frequency and microwave spectra, yielding precise molecular constants in both the ground and excited vibrational states for these two complexes. The band origins of (SO2)(2) are determined to be 1150.30319(13) cm(-1) for vibration on the electron-donor side and 1153.40911(10) cm(-1) for vibration on the electron-acceptor side, which is shifted from that of the SO2 v1 band by about-1.41 cm(-1) and + 1.70 cm(-1), respectively. The vibrational energies of the two tunneling components of Ar-SO(2 )are determined to be 1151.61315(11) cm(-1 )and 1151.64840(11) cm (-1). The tunneling splitting of Ar-SO2 increases from 982.881(32) MHz in the ground state to 1056.7(34) MHz in the excited vibrational state, indicating a decrease of the tunneling barrier upon excitation of the SO2 symmetric stretching vibration.
期刊：
Journal of Molecular Spectroscopy,2022年390:111714 ISSN：0022-2852
通讯作者：
Chuanxi Duan
作者机构：
[Zhu, Tianxin; Duan, Chuanxi; Li, Xiang; Pu, Yuanyuan] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Peoples R China.
通讯机构：
[Chuanxi Duan] C;College of Physical Science and Technology, Central China Normal University, Wuhan, China
关键词：
Rovibrational spectrum;SO2 complexes;Chalcogen bond
摘要：
Rovibrational absorption spectra of the N2-SO2 and OC-SO2 complexes in the v1 symmetric stretching region of SO2 have been measured in a supersonic slit jet expansion using a segmented rapid-scan quantum cascade laser spectrometer. The observed transitions are of c-type for both complexes. The possible tunneling splittings for N2- SO2 or OC-SO2 are too small to be resolved under our experimental conditions. The observed infrared transitions are assigned and fitted using a standard S-reduced Watson asymmetric top Hamiltonian, yielding accurate molecular constants in the excited vibrational state. The band origins of N2-SO2 and OC-SO2 are determined to be 1152.574299(63) cm-1 and 1153.141389(45) cm-1, which shows a blue-shift from that of the monomer by about 0.86 cm-1 and 1.43 cm-1, respectively.
作者机构：
[Zheng, Rui; Wang, Rui-Bo; Li, Song; Huang, Guang-Ming; Duan, Chuan-Xi] College of Physical Science and Technology, Huazhong Normal University, Wuhan 430079, China
通讯机构：
[Zheng, R.] C;College of Physical Science and Technology, , Wuhan 430079, China
作者：
Liu Yu-yan;Liu Xiao-yong;Liu Hong-ping;Guo Yuan-qing;Huang Guang-ming;...
期刊：
中国物理B,2000年9(9):652-655 ISSN：1674-1056
通讯作者：
Liu, Y.-Y.
作者机构：
Department of Physics, East China Normal University, Shanghai 200062, China;[Lin Jie-li; Liu Hong-ping; Duan Chuan-xi; Gao Hui; Guo Yuan-qing; Liu Xiao-yong] State Key Lab. Magnetic Reson. A., Wuhan Inst. of Phys. and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;[Huang Guang-ming] Department of Physics, Central China Normal University, Wuhan 430079, China;[Liu Yu-yan] Department of Physics, East China Normal University, Shanghai 200062, China, State Key Lab. Magnetic Reson. A., Wuhan Inst. of Phys. and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
通讯机构：
[Liu, Y.-Y.] D;Department of Physics, , Shanghai 200062, China
关键词：
Global analysis;Molecular constants;PO2
摘要：
A global analysis of all available and identified spectra of the PO2 radical has been performed. In this analysis, the infrared spectra of the ν3 band, the microwave and far infrared laser magnetic resonance transitions in the ground state are fitted simultaneously to the effective Hamiltonian for asymmetric top molecules. Since the analysis absorbs reliable experimental data extensively, it bears the most precise and most complete set of molecular constants for PO2. These molecular constants can be used to reproduce the spectra of PO2 accurately. Attention is also paid to the similarity and difference between PO2 and NO2.
