Photodissociation dynamics of SO2 between 193 and 201 nm

The nonadiabatic interactions between the C̃ state and neighboring electronic states of SO2 have attracted much attention; however, the predissociation mechanisms are not yet completely understood. In this work, the predissociation dynamics of SO2 via its C̃ state have been investigated at λ = 193–2...

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Veröffentlicht in:The Journal of chemical physics 2023-07, Vol.159 (2)
Hauptverfasser: Luo, Zijie, Zhang, Zhaoxue, Yang, Shuaikang, Zhao, Yarui, Li, Zhenxing, He, Zhigang, Chang, Yao, Che, Li, Yuan, Kaijun, Yang, Xueming
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container_issue 2
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container_title The Journal of chemical physics
container_volume 159
creator Luo, Zijie
Zhang, Zhaoxue
Yang, Shuaikang
Zhao, Yarui
Li, Zhenxing
He, Zhigang
Chang, Yao
Che, Li
Yuan, Kaijun
Yang, Xueming
description The nonadiabatic interactions between the C̃ state and neighboring electronic states of SO2 have attracted much attention; however, the predissociation mechanisms are not yet completely understood. In this work, the predissociation dynamics of SO2 via its C̃ state have been investigated at λ = 193–201 nm by using the time-sliced velocity map ion imaging technique. The translational energy distributions and the branching ratios of the O(3PJ=2,1,0) spin–orbit products at six photolysis wavelengths have been acquired. The SO(3Σ−) product population gradually decreases in v = 0 and increases in v = 2 as the photolysis wavelength decreases. The branching ratios of O(3P J=2,1,0) products are almost similar at most wavelengths, except at 194.8 nm. Our data suggest that the predissociation between 193 and 201 nm is via an avoided crossing between the C̃ state and the repulsive triplet 23A′ state. The state-to-state dynamical pictures shown in this work provide a rigorous test of the potential energy surfaces (PESs) of the SO2 and the nonadiabatic couplings between these PESs.
doi_str_mv 10.1063/5.0157095
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Couplings
Electron states
Imaging techniques
Photodissociation
Photolysis
Potential energy
Wavelengths
title Photodissociation dynamics of SO2 between 193 and 201 nm
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