1
|
Mao L, Liu J, Habibulla N, Qiu Y. Experimental study of rotational relaxation for D2(1,12) in collisions with N2. J Chem Phys 2024; 160:154305. [PMID: 38624121 DOI: 10.1063/5.0197067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Accepted: 03/28/2024] [Indexed: 04/17/2024] Open
Abstract
The rotational relaxation behavior of D2(1,12) in a D2-N2 mixture was investigated using coherent anti-Stokes Raman scattering (CARS) technique. The rovibrational level v = 1 and J = 12 of D2 was selectively excited through stimulated Raman pumping while monitoring the temporal evolution of population for D2(1, J ≤ 12) molecules using time-resolved CARS spectroscopy. The results demonstrate that the rotational relaxation processes of D2(1,12) encompass both multi-quantum relaxation and continuous single-quantum relaxation. When α, the molar ratio of N2, is less than 0.5, D2(1,12) predominantly undergoes a single quantum relaxation process transition. However, when α ≥ 0.5, the multi-quantum relaxation mechanism gradually predominates. The total rotational relaxation rate coefficients of D2(1,12) collisions with N2 and D2 at 295 K were determined to be 3.974 × 10-14 and 1.179 × 10-14 cm3 s-1, respectively. The temperature dependence of rotational relaxation rate of D2(1,12) was investigated within the temperature range of 295-453 K. With increasing temperature, the dominant relaxation process exhibited an accelerated behavior, while the minor relaxation process remained largely unaffected. The rotational temperature of the D2 molecule at various N2 molar ratios was determined through the utilization of Boltzmann plots. The rotational temperature undergoes a rapid decline within 2 μs, corresponding to the near-resonant rotation-vibration relaxation process of D2(1,12) collisions with N2. The system reaches a quasi-equilibrium state when the delay time is 3 μs. The findings of this study can serve as a valuable empirical basis for further validation of the kinetic theory and simulation.
Collapse
Affiliation(s)
- Lin Mao
- Xinjiang Key Laboratory of Solid State Physics and Devices, Xinjiang University, Urumqi 830017, China
- School of Physical Science and Technology, Xinjiang University, Urumqi 830017, China
| | - Jing Liu
- Xinjiang Key Laboratory of Solid State Physics and Devices, Xinjiang University, Urumqi 830017, China
- School of Physical Science and Technology, Xinjiang University, Urumqi 830017, China
| | - Nurali Habibulla
- Xinjiang Key Laboratory of Solid State Physics and Devices, Xinjiang University, Urumqi 830017, China
- School of Physical Science and Technology, Xinjiang University, Urumqi 830017, China
| | - Yongbao Qiu
- Xinjiang Key Laboratory of Solid State Physics and Devices, Xinjiang University, Urumqi 830017, China
- School of Physical Science and Technology, Xinjiang University, Urumqi 830017, China
| |
Collapse
|
2
|
Zhang Y, Xu J. An analytic global potential energy surface of the CsH 2 system and the dynamic calculations of the H + CsH reaction. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2151524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Affiliation(s)
- Yong Zhang
- NEST Lab, Department of Chemistry, Department of Physics, College of Science, Shanghai University, Shanghai, People’s Republic of China
- Department of Physics, Tonghua Normal University, Tonghua, People’s Republic of China
| | - Jiaqiang Xu
- NEST Lab, Department of Chemistry, Department of Physics, College of Science, Shanghai University, Shanghai, People’s Republic of China
| |
Collapse
|
3
|
Zhang Y, Xu J, Yang H, Xu J. The global potential energy surface of the RbH2 system and dynamics studies of the H + RbH → Rb + H2 reaction. Chem Phys 2022. [DOI: 10.1016/j.chemphys.2022.111586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
4
|
Zhang Y, Xu J, Yang H, Xu J. Nonadiabatic dynamics studies of the H( 2S) + RbH(X 1Σ +) reaction: based on new diabatic potential energy surfaces. RSC Adv 2022; 12:19751-19762. [PMID: 35865202 DOI: 10.1039/d2ra03028d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Accepted: 06/14/2022] [Indexed: 11/21/2022] Open
Abstract
The global diabatic potential energy surfaces (PESs) that correspond to the ground (12A') and first excited states (22A') of the RbH2 system PES are constructed based on 17 786 ab initio points. The neural network method is used to fit the PESs and the topographic features of the new diabatic PESs are discussed in detail. Based on the newly constructed diabatic PESs, the dynamics calculations of the H(2S) + RbH(X1Σ+) → Rb(52S) + H2(X1Σg +)/Rb(52P) + H2(X1Σg +) reactions are performed using the time-dependent wave packet method. The dynamics properties of these two channels such as the reaction probabilities, integral cross sections, and differential cross sections (DCSs) are calculated at state-to-state level of theory. The nonadiabatic effects are discussed in detail, and the results indicate that the adiabatic results are overestimated from the dynamics values. The DCSs of these two channels are forward biased, which indicates that the abstraction mechanism plays a dominant role in the reaction.
Collapse
Affiliation(s)
- Yong Zhang
- NEST Lab, Department of Chemistry, Department of Physics, College of Science, Shanghai University Shanghai 200444 China .,Department of Physics, Tonghua Normal University Tonghua Jilin 134002 China
| | - Jinghua Xu
- Department of Physics, Tonghua Normal University Tonghua Jilin 134002 China
| | - Haigang Yang
- Department of Physics, Tonghua Normal University Tonghua Jilin 134002 China
| | - Jiaqiang Xu
- NEST Lab, Department of Chemistry, Department of Physics, College of Science, Shanghai University Shanghai 200444 China
| |
Collapse
|
5
|
Bai Y, Buren B, Yang Z, Chen M. Time-dependent wave packet dynamics study of non-adiabatic Li(2p) + HD → LiH/LiD + D/H reaction in a diabatic representation. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2020.138279] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
6
|
Li W, Wang X, Zhao H, He D. Non-adiabatic dynamics studies of the K(4p 2P) + H 2(X 1Σ) reaction based on new diabatic potential energy surfaces. Phys Chem Chem Phys 2020; 22:16203-16214. [PMID: 32643736 DOI: 10.1039/d0cp02859b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Global diabatic potential energy surfaces (PESs) of the KH2 system corresponding to the ground (12A') and first excited (22A') states were constructed for the first time. In ab initio calculations, the MRCI-F12 method with AVTZ and def2-QZVP basis sets was adopted and 17 865 ab initio energy points were calculated. The mixing angle, which is used to obtain the diabatic energies, was calculated by the molecular properties of the transition dipole moment. The diabatic PESs were fitted individually by the permutation invariant polynomial neural network method and the topographical features of the diabatic PESs are discussed in detail. The non-adiabatic dynamics studies of the K(4p2P) + H2(v0 = 0, 1, j0 = 0) reaction were carried out using the APH method based on the new diabatic PESs. The collision reaction processes K(4p2P) + H2(v0 = 0, 1, j0 = 0) → H + KH and the quenching processes K(4p2P) + H2(v0 = 0, 1, j0 = 0) → K(4s2S) + H2 were studied at the state-to-state level of theory. For the reaction process, the dynamics results indicated that the vibrational excitation of H2 was significantly more effective at promoting the reaction than the translational energy. In addition, the differential cross-sections were forward-biased scattering, which indicated that the direct abstraction mechanism plays a dominant role in the reaction. For the quenching process, the vibrational excitation of H2 molecules could improve the quenching efficiency obviously.
Collapse
Affiliation(s)
- Wentao Li
- Center for Theoretical and Computational Chemistry and State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| | - Xuemei Wang
- Weifang University of Science and Technology, Shouguang 262700, China
| | - Hailin Zhao
- Center for Theoretical and Computational Chemistry and State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| | - Di He
- School of Physics and Optoelectronics Engineering, Ludong University, Yantai 264025, China
| |
Collapse
|
7
|
Wang S, Yang Z, Yuan J, Chen M. New diabatic potential energy surfaces of the NaH 2 system and dynamics studies for the Na(3p) + H 2 → NaH + H reaction. Sci Rep 2018; 8:17960. [PMID: 30568250 PMCID: PMC6299287 DOI: 10.1038/s41598-018-35987-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Accepted: 11/14/2018] [Indexed: 12/04/2022] Open
Abstract
The Na(3p) + H2(X1Σg+) → NaH(X1Σ+) + H(2S) reaction plays an important role in the field of diabatic reaction dynamics. A set of new diabatic potential energy surfaces (PESs) of the NaH2 system are structured, which include the diabatic coupling between the lowest two adiabatic states. The electronic structure calculations are performed on the multi-reference configuration interaction level with the cc-pwCVQZ and aug-cc-PVQZ basis sets for Na and H atoms. 32402 geometries are chosen to construct the diabatic data by a unitary transformation based on the molecular property method. The diabatic matrix elements of [Formula: see text], [Formula: see text] and [Formula: see text] ([Formula: see text]) are fitted by the artificial neural network model. The spectroscopic constants of diatoms obtained from the present PESs are consistent with the experimental data. The topographical and intersection characteristics of the [Formula: see text] and [Formula: see text] surfaces are discussed. Based on the new PESs, the time-dependent quantum wave packet calculations are carried out to study the reaction mechanism of the title reaction in detail.
Collapse
Affiliation(s)
- Shufen Wang
- Key Laboratory of Materials Modification by Laser, Electron, and Ion Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian, 116024, P.R. China
| | - Zijiang Yang
- Key Laboratory of Materials Modification by Laser, Electron, and Ion Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian, 116024, P.R. China
| | - Jiuchuang Yuan
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, 116023, P.R. China
| | - Maodu Chen
- Key Laboratory of Materials Modification by Laser, Electron, and Ion Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian, 116024, P.R. China.
| |
Collapse
|
8
|
Yuan J, Duan Z, Wang S, Liu J, Han K. Significant effects of vibrational excitation of reactant in K + H 2 → H + KH reaction based on a new neural network potential energy surface. Phys Chem Chem Phys 2018; 20:20641-20649. [PMID: 30059113 DOI: 10.1039/c8cp03310b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The study of K + H2 collision has a long experimental history, but there have been few theoretical studies due to lack of a global potential energy surface (PES). In this study, a new global PES for the ground state of KH2 system was constructed based on numerous ab initio points, using the permutation invariant polynomial neural network method. The root mean square error (RMSE) of PES is very small (5.64 meV). On the new PES, time-dependent quantum wave packet (TDWP) and quasiclassical trajectory (QCT) calculations were carried out to study the dynamics of the K(2S) + H2(X1Σ+g) → H(2S) + KH(X1Σ+) reaction. Dynamics results show that (i) the K + H2(v = 0) → H + KH reaction scarcely occurred, (ii) the K + H2(v = 1) → H + KH reaction took place in small quantities, and (iii) the K + H2(v = 2) → H + KH reaction occurred in large quantities. This indicates that vibrational energy of the reactant is significantly more effective at promoting the reaction than the translational energy. This characteristic stems from a major physical model in reactive collisions: the vibrationally excited H2 molecule and K atom collide first in a T-geometric configuration and the vibrational motion of the H2 molecule helps separate the two H atoms a large distance after the collision. At a large H-H distance, a broad well exists on the PES, so the heavy K atom could pull back the light H atom to initiate the reaction. Similar to the reactive channel, vibrational excitation of the reactant also has a significant effect on the collision-induced dissociation channel.
Collapse
Affiliation(s)
- Jiuchuang Yuan
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, P. R. China.
| | | | | | | | | |
Collapse
|
9
|
Wang S, Yuan J, Li H, Chen M. A neural network potential energy surface for the NaH 2 system and dynamics studies on the H( 2S) + NaH(X 1Σ +) → Na( 2S) + H 2(X 1Σ g+) reaction. Phys Chem Chem Phys 2017; 19:19873-19880. [PMID: 28597884 DOI: 10.1039/c7cp02153d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
In order to study the dynamics of the reaction H(2S) + NaH(X1Σ+) → Na(2S) + H2(X1Σg+), a new potential energy surface (PES) for the ground state of the NaH2 system is constructed based on 35 730 ab initio energy points. Using basis sets of quadruple zeta quality, multireference configuration interaction calculations with Davidson correction were carried out to obtain the ab initio energy points. The neural network method is used to fit the PES, and the root mean square error is very small (0.00639 eV). The bond lengths, dissociation energies, zero-point energies and spectroscopic constants of H2(X1Σg+) and NaH(X1Σ+) obtained on the new NaH2 PES are in good agreement with the experiment data. On the new PES, the reactant coordinate-based time-dependent wave packet method is applied to study the reaction dynamics of H(2S) + NaH(X1Σ+) → Na(2S) + H2(X1Σg+), and the reaction probabilities, integral cross-sections (ICSs) and differential cross-sections (DCSs) are obtained. There is no threshold in the reaction due to the absence of an energy barrier on the minimum energy path. When the collision energy increases, the ICSs decrease from a high value at low collision energy. The DCS results show that the angular distribution of the product molecules tends to the forward direction. Compared with the LiH2 system, the NaH2 system has a larger mass and the PES has a larger well at the H-NaH configuration, which leads to a higher ICS value in the H(2S) + NaH(X1Σ+) → Na(2S) + H2(X1Σg+) reaction. Because the H(2S) + NaH(X1Σ+) → Na(2S) + H2(X1Σg+) reaction releases more energy, the product molecules can be excited to a higher vibrational state.
Collapse
Affiliation(s)
- Shufen Wang
- Key Laboratory of Materials Modification by Laser, Electron, and Ion Beams (Ministry of Education), School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, 116024, P. R. China.
| | | | | | | |
Collapse
|
10
|
Shen X, Wang S, Dai K, Shen Y. Nascent rotational distribution for LiH(v=0-3,J) states from collisions with H 2(E=4300 and 4800cm -1). SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 173:516-526. [PMID: 27741492 DOI: 10.1016/j.saa.2016.09.048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 08/28/2016] [Accepted: 09/26/2016] [Indexed: 06/06/2023]
Abstract
Rotationally state selective excitation of H2(v=1, J=1 or 3) was achieved by stimulated Raman pumping. The full state-resolved distribution of scattered LiH(v=0-3, J=0~13)molecules from collisions with excited H2(E=4300 and 4800cm-1) is reported. Nascent rotational and translational energy profiles for scattered LiH(v=0~3) molecules with J=0~13 were measured using high-resolution transient laser induced fluorescence(LIF). The product translational energy for individual J-states increases by 120% for a 13% increase in donor energy. The scattered LiH(v=0, J=0~13) molecules have a biexponential rotational distribution. Fitting the data with a two-component exponential model yields a low-energy distribution and a high-energy distribution. The rotational distribution is sensitive to donor energy. Rotational distributions of scatted LiH(v=1-3) molecules were also measured. The distribution yielded rotational temperatures at 690K for LiH/H2(E=4300cm-1) and 730K for LiH/H2(E=4800cm-1), respectively. The rate constants for appearance LiH(v=0-3,J) were determined.
Collapse
Affiliation(s)
- Xiaoyan Shen
- School of Chemistry and Molecular Engineering, East China University of Sci.&Tech., Shanghai, 200237, China
| | - Shuying Wang
- School of Physics, Xinjiang University, Urumqi, 830046, China
| | - Kang Dai
- School of Physics, Xinjiang University, Urumqi, 830046, China
| | - Yifan Shen
- School of Physics, Xinjiang University, Urumqi, 830046, China
| |
Collapse
|
11
|
|
12
|
Hsiao MK, Lin KC, Hung YM. Quasiclassical trajectory calculations for Li(22PJ) + H2 → LiH(X1Σ+) + H: Influence by vibrational excitation and translational energy. J Chem Phys 2011; 134:034119. [DOI: 10.1063/1.3519801] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
13
|
|
14
|
Chang YP, Hsiao MK, Liu DK, Lin KC. Rotational and vibrational state distributions of NaH in the reactions of Na(4S2,3D2,and6S2) with H2: Insertion versus harpoon-type mechanisms. J Chem Phys 2008; 128:234309. [DOI: 10.1063/1.2939570] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
15
|
Hattaway BC, Bililign S, Uhl L, Ledentu V, Jeung GH. Energy transfer in Li(4p) + (Ar,H2,CH4) collisions. J Chem Phys 2004; 120:1739-45. [PMID: 15268303 DOI: 10.1063/1.1634557] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The direct collisional energy transfer processes of the excited states of Li(4p) by several gases are investigated under gas cell conditions. The nonreactive absorption profiles of the collision complex are monitored as a function of laser detuning from the Li(2s-4p) resonances. Pronounced structures in the absorption spectra along with high level ab initio calculations of the relevant potential energy surfaces are used to understand the experimental results.
Collapse
Affiliation(s)
- Brian C Hattaway
- Department of Physics, North Carolina Agricultural and Technical State University, Greensboro, North Carolina 27411, USA
| | | | | | | | | |
Collapse
|
16
|
Chen JJ, Lin KC. Influence of vibrational excitation on the reaction Li(2 2PJ)+H2(v=1)→LiH(X 1Σ+)+H. J Chem Phys 2003. [DOI: 10.1063/1.1620997] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
17
|
Chen JJ, Song YW, Lin KC, Hung YM. Reaction pathway and energy disposal of the CaH product in the reaction of Ca(4s4p 1P1)+CH4→CaH(X 2∑+)+CH3. J Chem Phys 2003. [DOI: 10.1063/1.1545107] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
|
18
|
Kim KH, Lee HS, Lee YS, Jeung GH. Potential energy surfaces for the photochemical reactions Ca*+H2→CaH+H. J Chem Phys 2002. [DOI: 10.1063/1.1425407] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
|
19
|
Chen JJ, Hung YM, Liu DK, Fung HS, Lin KC. Reaction pathway, energy barrier, and rotational state distribution for Li (2 2PJ)+H2→LiH (X 1Σ+)+H. J Chem Phys 2001. [DOI: 10.1063/1.1370070] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
|
20
|
Bililign S, Hattaway BC, Robinson TL, Jeung GH. Far-wing scattering studies on the reaction Li*(2p,3p)+H2→LiH(v″=1,2,J″)+H. J Chem Phys 2001. [DOI: 10.1063/1.1359774] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
|
21
|
Lee HS, Lee YS, Jeung GH. Potential Energy Surfaces for LiH2and Photochemical Reactions Li*+ H2↔ LiH + H. J Phys Chem A 1999. [DOI: 10.1021/jp9921295] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
22
|
Affiliation(s)
- Li-Hsyan Fan
- Department of Chemistry, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung 402, Taiwan, Republic of China
| | - Jye-Jong Chen
- Department of Chemistry, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung 402, Taiwan, Republic of China
| | - Yann-Yow Lin
- Department of Chemistry, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung 402, Taiwan, Republic of China
| | - Wei-Tzou Luh
- Department of Chemistry, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung 402, Taiwan, Republic of China
| |
Collapse
|