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Photodissociation Dynamics of OCS near 128 nm: The S (3PJ=2, 1, 0), S(1D2) and S(1S0) Channels
王兴安
1. Hefei National Laboratory for Materials Science at Microscales and Department of Chemical Physics, University of Science and Technology of China, 96 Jinzhai Road, Hefei 230026, P. R. China
Abstract:
Here we report the study of the photodissociation dynamics of carbonyl sulfide in the vacuum ultraviolet (VUV) region using the time-sliced velocity map ion imaging technique. Images of S (3PJ=2, 1, 0), S(1D2) and S(1S0) products were measured at four photolysis wavelengths, from 129.32 to 126.08 nm, respectively. Four main dissociation channels: S(3PJ=2,1,0) + CO(X1Σ+)/CO(A3Π), S(1D2) + CO(X1Σ+) and S(1S0) + CO(X1Σ+) channels, have been clearly observed and identified. The vibrational states of the CO co-products were partially resolved in the experimental images. From these images, the product total kinetic energy releases, the branching ratios and angular distributions of products have also been derived. The results suggest that the S(3PJ=2,1,0) + CO(A3Π) product channel is formed through the adiabatic dissociation process after the excitation to the (31Σ+) excited state. Strong nonadiabatic coupling also plays an important role in the formation of other three channels.
Key words:  VUV photodissociation, OCS, velocity map ion imaging
FundProject:
Photodissociation Dynamics of OCS near 128 nm: The S (3PJ=2, 1, 0), S(1D2) and S(1S0) Channels
王兴安
中国科学院大连化学物理研究所分子反应动力学国家重点实验室
摘要:
Here we report the study of the photodissociation dynamics of carbonyl sulfide in the vacuum ultraviolet (VUV) region using the time-sliced velocity map ion imaging technique. Images of S (3PJ=2, 1, 0), S(1D2) and S(1S0) products were measured at four photolysis wavelengths, from 129.32 to 126.08 nm, respectively. Four main dissociation channels: S(3PJ=2,1,0) + CO(X1Σ+)/CO(A3Π), S(1D2) + CO(X1Σ+) and S(1S0) + CO(X1Σ+) channels, have been clearly observed and identified. The vibrational states of the CO co-products were partially resolved in the experimental images. From these images, the product total kinetic energy releases, the branching ratios and angular distributions of products have also been derived. The results suggest that the S(3PJ=2,1,0) + CO(A3Π) product channel is formed through the adiabatic dissociation process after the excitation to the (31Σ+) excited state. Strong nonadiabatic coupling also plays an important role in the formation of other three channels.
关键词:  VUV photodissociation, OCS, velocity map ion imaging
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