Photodissociation dynamics of OCS near 128 nm: S(3PJ=2,1,0), S(1D2) and S(1S0) channels
| Autor: | Wentao Chen, Daofu Yuan, Si-wen Wang, Ling Tang, Xingan Wang, Xueming Yang, Shengrui Yu |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Photodissociation Analytical chemistry 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Kinetic energy 01 natural sciences Dissociation (chemistry) 0104 chemical sciences Ion chemistry.chemical_compound Vibronic coupling chemistry Excited state Physical and Theoretical Chemistry 0210 nano-technology Excitation Carbonyl sulfide |
| Zdroj: | Chinese Journal of Chemical Physics. 33:167-172 |
| ISSN: | 2327-2244 1674-0068 |
| Popis: | Here we report the study of the photodissociation dynamics of carbonyl sulfide in the vacuum ultraviolet 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 wave-lengths of 129.32, 128.14, 126.99, and 126.08 nm, respectively. Four main dissociation channels: S(3PJ=2,1,0)+CO(X1Σ+), S(3PJ=2,1,0)+CO(A3Π), S(1D2)+CO(X1Σ+) and S(1S0)+CO(X1Σ+) channels, have been clearly observed and identified. 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 been derived. While 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, the results suggest that strong nonadiabatic coupling plays an important role in the formation of other three channels. |
| Databáze: | OpenAIRE |
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