| Autor: |
Kuroko Y; Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan., Kohguchi H; Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan., Yamasaki K; Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan. |
| Abstrakt: |
The internal energy distributions of reaction products are important information in clarifying the mechanism of chemical reactions. There are few reports of the nascent vibrational energy distribution of CS(X 1 Σ + ) generated in the S( 1 D) + CS 2 reaction. As long as S( 1 D) is produced by photodissociation of CS 2 , CS(X 1 Σ + ), as a product of the chemical reaction and as a photoproduct of CS 2 is indistinguishable. In this study, S( 1 D) was generated by the photolysis of OCS at 248 nm, where CS 2 hardly dissociates, and CS(X 1 Σ + ) was generated only by the S( 1 D) + CS 2 reaction. The vibrational levels v ″ = 0-6 of CS(X 1 Σ + ) were detected with laser-induced fluorescence (LIF) via the A 1 Π-X 1 Σ + transition. The identical time profiles of the LIF intensities showed that all the vibrational levels were produced by the S( 1 D) + CS 2 reaction. The relative nascent vibrational populations of CS(X 1 Σ + ) determined from the area intensities of the excitation spectra are 1.00 ± 0.11/0.58 ± 0.06/0.31 ± 0.03/0.078 ± 0.009/0.013 ± 0.001/<0.002/<0.002 (the values for v ″ = 5 and 6 are the upper limits) for v ″ = 0/1/2/3/4/5/6. The distribution agrees well with the statistical (prior) distribution. |
