Photodissociation of nitrous oxide (N2O) in the ultraviolet region has been revisited by using the time-sliced velocity map ion imaging technique, due to its importance in atmospheric chemistry. The images of O(1D) photofragments are recorded at 203.814 nm and 205.472 nm in one-color experiments and at eight photolysis wavelengths between 200 and 220 nm in two-color experiments. The rotational state distributions and angular anisotropy parameters of the co-products are derived from the images. The results indicate that the rotational state distributions are inverted with the maximum around J≈70. The anisotropy parameter β mainly shows two declines as the N2 rotational quantum number Jincreases. According to theoretical calculations [J. Chem. Phys. 136, 044314 (2012)], the variations in β with J are caused by changes in the extent of axial recoil from a linear initial configuration. In the high-J region, however, additional torque exists on the ground state potential energy surface following nonadiabatic transitions, inducing both the additional rotational excitation and the lower β values. Compared to previous works, the two-color experiments combined with single vacuum ultraviolet photonionization of O(1D) allow us to acquire both the rotational state distribution and angular distribution accurately. This work deepens our understanding of triatomic molecule decomposition.
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April 2024
Research Article|
April 01 2024
Photodissociation dynamics of nitrous oxide: The product channel†
Special Collection:
In Memory of Prof. Qihe Zhu on the occasion of his 100th Anniversary
Shuaikang Yang;
Shuaikang Yang
a
Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China
, Hefei 230026, China
b
State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
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Yucheng Wu;
Yucheng Wu
b
State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
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Zijie Luo;
Zijie Luo
b
State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
c
Marine Engineering College, Dalian Maritime University
, Dalian 116026, China
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Zhenxing Li;
Zhenxing Li
b
State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
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Wei Hua;
Wei Hua
b
State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
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Yao Chang;
Yao Chang
b
State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
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Xingan Wang;
Xingan Wang
*
a
Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China
, Hefei 230026, China
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Kaijun Yuan;
Kaijun Yuan
*
b
State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
d
Hefei National Laboratory
, Hefei 230088, China
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Xueming Yang
Xueming Yang
b
State Key Laboratory of Molecular Reaction Dynamics and Dalian Coherent Light Source, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
, Dalian 116023, China
d
Hefei National Laboratory
, Hefei 230088, China
e
Department of Chemistry and Center for Advanced Light Source Research, College of Science, Southern University of Science and Technology
, Shenzhen 518055, China
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†
Part of Special Issue “In Memory of Prof. Qihe Zhu on the occasion of his 100th Aniversary”.
Chin. J. Chem. Phys. 37, 286–294 (2024)
Article history
Received:
December 22 2023
Accepted:
January 10 2024
Citation
Shuaikang Yang, Yucheng Wu, Zijie Luo, Zhenxing Li, Wei Hua, Yao Chang, Xingan Wang, Kaijun Yuan, Xueming Yang; Photodissociation dynamics of nitrous oxide: The product channel. Chin. J. Chem. Phys. 1 April 2024; 37 (2): 286–294. https://doi.org/10.1063/1674-0068/cjcp2312135
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