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Experiment study of energy redistribution during collisions of the excited state H2(1, 7) with LiH |
| Kai Wang(王凯)1,2,†, Zhong Liu(刘中)1,2,†, Shuying Wang(王淑英)1,2,‡, Chu Qin(秦楚)1,2, Zilei Yu(於子雷)1,2, and Xiaofang Zhao(赵小芳)1,2,3 |
1 Xinjiang Key Laboratory of Solid State Physics and Devices, Xinjiang University, Urumqi 830017, China;
2 School of Physical Science and Technology, Xinjiang University, Urumqi 830017, China;
3 Tarim University, Alar 843300, Chin |
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Abstract The H$_{2}$ was excited to the H$_{2}$ X$^{1}\Sigma ^+_{\rm g}$ ($v=1$, $J=7$) energy level by the stimulated Raman pumping (SRP) technique, and the process of energy redistribution between H$_{2}(1,7)$ molecule and LiH was studied. The particle population density of H$_{2}(1,7)$ energy level is obtained by the coherent anti-Stokes Raman scattering (CARS) technique. The particle population density of each rotational level of H$_{2}$ ($v=1$, $J=7$, 5, 3) is analyzed with temperature after the collision between H$_{2}(1,7)$ molecule and LiH. It is found that the particle population density of each level increases with the increase in temperature after the collision. The time-resolved CARS spectra of each rotational energy level of H$_{2}$ ($v=1$, $J=7$, 5, 3) are analyzed at different temperatures. It is found that a multi-quantum relaxation process with $\Delta J=4$ occurs in H$_{2}(1,7)$ molecule, and the temperature accelerates the relaxation process. The effective lifetime of H$_{2}(1,7)$ energy level is obtained by plotting the semi-logarithmic plots of the CARS signal intensity and delay time of the level, and observing the law of the effective lifetime change with the temperature. It is found that the effective lifetime of H$_{2}(1,7)$ energy level shows an obvious decreasing trend with the increase of temperature.
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Received: 09 March 2025
Revised: 30 April 2025
Accepted manuscript online: 07 May 2025
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PACS:
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34.50.-s
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(Scattering of atoms and molecules)
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34.20.-b
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(Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions)
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34.30.-e
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34.60.+z
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| Fund: Project supported by the Natural Science Foundation of Xinjiang Uygur Autonomous Region (Grant No. 2023D01C06) and the National Natural Science Foundation of China (Grant No. 12164047). |
Corresponding Authors:
Shuying Wang
E-mail: wsysmilerr@sina.com
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| About author: 2025-113401-250382.pdf |
Cite this article:
Kai Wang(王凯), Zhong Liu(刘中), Shuying Wang(王淑英), Chu Qin(秦楚), Zilei Yu(於子雷), and Xiaofang Zhao(赵小芳) Experiment study of energy redistribution during collisions of the excited state H2(1, 7) with LiH 2025 Chin. Phys. B 34 113401
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