Nascent Vibrational Energy Distribution of CS(X 1 Σ + ) Generated in the S( 1 D) + CS 2 Reaction

Nascent Vibrational Energy Distribution of CS(X 1 Σ + ) Generated in the S( 1 D) + CS 2 Reaction

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 Σ ) generated in the S( D) + CS reaction. As long as S( D) is produced by photodissociation...

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Veröffentlicht in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2023-05, Vol.127 (18), p.4055-4062
Hauptverfasser: Kuroko, Yuri, Kohguchi, Hiroshi, Yamasaki, Katsuyoshi
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container_title The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory
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creator Kuroko, Yuri
Kohguchi, Hiroshi
Yamasaki, Katsuyoshi
description 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 Σ ) generated in the S( D) + CS reaction. As long as S( D) is produced by photodissociation of CS , CS(X Σ ), as a product of the chemical reaction and as a photoproduct of CS is indistinguishable. In this study, S( D) was generated by the photolysis of OCS at 248 nm, where CS hardly dissociates, and CS(X Σ ) was generated only by the S( D) + CS reaction. The vibrational levels ″ = 0-6 of CS(X Σ ) were detected with laser-induced fluorescence (LIF) via the A Π-X Σ transition. The identical time profiles of the LIF intensities showed that all the vibrational levels were produced by the S( D) + CS reaction. The relative nascent vibrational populations of CS(X 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/
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There are few reports of the nascent vibrational energy distribution of CS(X Σ ) generated in the S( D) + CS reaction. As long as S( D) is produced by photodissociation of CS , CS(X Σ ), as a product of the chemical reaction and as a photoproduct of CS is indistinguishable. In this study, S( D) was generated by the photolysis of OCS at 248 nm, where CS hardly dissociates, and CS(X Σ ) was generated only by the S( D) + CS reaction. The vibrational levels ″ = 0-6 of CS(X Σ ) were detected with laser-induced fluorescence (LIF) via the A Π-X Σ transition. The identical time profiles of the LIF intensities showed that all the vibrational levels were produced by the S( D) + CS reaction. The relative nascent vibrational populations of CS(X 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/&lt;0.002/&lt;0.002 (the values for ″ = 5 and 6 are the upper limits) for ″ = 0/1/2/3/4/5/6. 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title Nascent Vibrational Energy Distribution of CS(X 1 Σ + ) Generated in the S( 1 D) + CS 2 Reaction
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