Ar-D_2O复合物在D_2O弯曲振动模附近的新振转子带
作者：
Li, Xiang;Liu, Yun;Zhu, Tian-Xin;Duan, Chuan-Xi
期刊：
物理学报 ,2023年72(1):68-77 ISSN：1000-3290
通讯作者：
Duan, CX
作者机构：
[Zhu, Tian-Xin; Duan, Chuan-Xi; Li, Xiang; Liu, Yun] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
通讯机构：
[Duan, CX ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
分子间相互作用;水复合物;振动转动光谱
摘要：
稀有气体原子和水分子组成的范德瓦耳斯复合物是研究水和其他原子分子之间相互作用的典型模型.本文利用中红外连续外腔量子级联激光器结合脉冲超声分子束吸收光谱技术,在D2O弯曲振动带(v2展开更多 稀有气体原子和水分子组成的范德瓦耳斯复合物是研究水和其他原子分子之间相互作用的典型模型.本文利用中红外连续外腔量子级联激光器结合脉冲超声分子束吸收光谱技术,在D2O弯曲振动带(v2=1←0)附近测量了Ar-D2O复合物4个新的振动转动子带.基于赝双原子分子有效哈密顿量,本文对测量到的振动转动谱线和前人报道的下能级所涉及的纯转动谱线进行了最小二乘法全局拟合,得到了包括振动子能级能量、转动常数和离心畸变常数等在内的精确的基态和激发态分子参数.Ar-D2O的D2O弯曲振动激发的振动带头被精确确定为1177.92144(32)cm-1,该值比D2O单体的带头红移了约0.458 cm-1.将从实验得到的振动子能级能量与基于四维势能面的理论计算结果进行了比较,检验了理论计算方法的精度.收起
语种：
中文
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Mid-infrared Laser Spectroscopy of Jet-Cooled Formic Acid Trimer: Mode-Dependent Line Broadening in the C-O Stretching Region
作者：
Nejad, Arman;Li, Xiang;Zhu, Tianxin;Liu, Yun;Duan, Chuanxi
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.
关键词：
Absorption spectroscopy;Dimers;Time-resolved spectroscopy;C-O stretching region;High-resolution measurements;Infrared laser spectroscopy;Jet cooled;Laser absorption;Line broadening;Measurements of;Midinfrared;Recent progress;Spectra's;Formic acid
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. © 2023 American Chemical Society.
语种：
英文
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Determination of ionic polarizability by nonsequential double ionization
作者：
Wei, MingZheng;Kang, HuiPeng;Wang, YanLan;Quan, Wei;Chen, Jing;...
期刊：
PHYSICAL REVIEW A ,2023年108(2):023111 ISSN：2469-9926
通讯作者：
Kang, HP
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.
语种：
英文
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SF_6分子的10.6 μm高分辨射流冷却激光吸收光谱
作者：
Yuan, Hong-Rui;Liu, Tao;Zhu, Tian-Xin;Liu, Yun;Li, Xiang;...
期刊：
物理学报 ,2023年72(6):154-160 ISSN：1000-3290
通讯作者：
Duan, CX
作者机构：
[Yuan, Hong-Rui; Liu, Tao] Res Inst Phys & Chem Engn Nucl Ind, Tianjin 300180, Peoples R China.;[Liu, Tao] Sci & Technol Particle Transport & Separat Lab, Tianjin 300180, Peoples R China.;[Zhu, Tian-Xin; Duan, Chuan-Xi; Chen, Yang; Li, Xiang; Liu, Yun] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
通讯机构：
[Duan, CX ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
振动转动光谱;温室气体;同位素分离;超声射流
摘要：
六氟化硫(SF6)是一种长寿命的温室气体,其红外吸收光谱对模拟大气辐射平衡非常重要.SF6也是研究激光分离同位素原理和技术的典型体系之一.由于SF6分子较...展开更多 六氟化硫(SF6)是一种长寿命的温室气体,其红外吸收光谱对模拟大气辐射平衡非常重要.SF6也是研究激光分离同位素原理和技术的典型体系之一.由于SF6分子较重,其室温下的红外光谱非常密集,给利用吸收光谱技术监测不同SF6同位素分子的相对浓度带来很大困难.本文利用超声射流冷却和像散型多程吸收池技术,测量了32SF6和33SF6同位素分子在10.6μm波段的高分辨红外激光吸收光谱.处于振动基态的32SF6和33SF6分子在狭缝型超声射流中的转动温度约为10 K,谱线线宽约为0.0008 cm-1.在此条件下观测到了SF6一个新的热带,其Q支的位置在941.0 cm-1附近.将其初步归属为32SF6的(v1+v2+v3)–(v1+v2)带,对该热带进行简化的转动分析,并讨论利用该热带和33SF6的v3基频带进行33SF6/32SF6的相对浓度监测的可行性.收起
语种：
中文
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Rovibrational spectra of SO2-containing van der Waals complexes in the v1 region of SO2. Part II. SO2–H2O and SO2–D2O
作者：
Li, Xiang;Pu, Yuanyuan;Zhu, Tianxin;Liu, Yun;Duan, Chuanxi
期刊：
Journal of Molecular Spectroscopy ,2023年395:111809 ISSN：0022-2852
通讯作者：
Duan, CX
作者机构：
[Zhu, Tianxin; Duan, Chuanxi; Li, Xiang; Liu, Yun; 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：
Quantum cascade lasers;Van der Waals forces;Jet cooled;Laser spectrometers;Rapid scan;Rovibrational;Rovibrational spectrum;Stretching region;Sulphur dioxide complex;Symmetric stretching;Van der Waals complex;Water complexes;Sulfur dioxide
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. © 2023 Elsevier Inc.
语种：
英文
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Rovibrational spectra of Ar–SO2 and (SO2)2 van der Waals complexes in the v1 region of SO2
作者：
Li, Xiang;Pu, Yuanyuan;Liu, Zhuang;Sun, Yinxin;Duan, Chuanxi
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：
Excited states;Ground state;Microwave spectroscopy;Quantum cascade lasers;Quantum theory;Stretching;Supersonic aerodynamics;Van der Waals forces;Vibration analysis;Ar–SO2;Excited vibrational state;Rovibrational;Rovibrational spectrum;SO2 dimer;Spectra's;Symmetric stretching;Tunneling splittings;Van der Waals complex;Vibrational bands;Dimers
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–SO2 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. © 2021 Elsevier Inc.
语种：
英文
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Rovibrational spectra of SO2-containing van der Waals complexes in the v1 region of SO2. Part I. N2-SO2 and OC-SO2
作者：
Li, Xiang;Zhu, Tianxin;Pu, Yuanyuan;Duan, Chuanxi
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：
Excited states;Quantum cascade lasers;Red Shift;Supersonic aerodynamics;Chalcogen bond;Chalcogens;Jet expansion;Rapid scan;Rovibrational;Rovibrational spectrum;SO2 complex;Stretching region;Symmetric stretching;Van der Waals complex;Van der Waals forces
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. © 2022 Elsevier Inc.
语种：
英文
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