Vibronic analysis of the Ã2A1-X̃ 2E laser-induced fluorescence of jet-cooled CH3S

Su Yu Chiang; Yuan-Pern Lee

doi:10.1063/1.461786

Vibronic analysis of the Ã²A₁-X̃ ²E laser-induced fluorescence of jet-cooled CH₃S

Su Yu Chiang^*, Yuan-Pern Lee

^*Corresponding author for this work

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

The methylthio (CH₃S) radical has been formed by KrF laser photolysis of dimethyl disulfide (CH₃SSCH₃) in a free-jet expansion. The Ã²A₁←-X̃²E laser-induced fluorescence excitation spectrum was obtained in the wavelength region 350-382 nm. The origin lies at 26 526.3 cm^-1 and the spin-orbital splitting for X̃ (²E _3/2 and ²E_1/2) was determined to be -259.1 cm^-1 Several progressions indicated that v′₂ -1098 ±2, v′₃ = 401 ± 2 cm^-1 and (with less certainty) v′₆ = 635 ±10 cm^-1. The predissociation threshold was estimated to be slightly above 28 016 cm^-1, ∼ 1490 cm^-1 above the v′ = 0 level of the A state. The dispersed fluorescence was observed in the 363-530 nm region. The main progressions give v″₂ = 1313 ±5 cm^-1, v″₃ = 727 ±3 cm^-1, and v″₅ = 1496 ± 6 cm^-1. Weaker lines are also consistent with some possible vibrational frequencies v″₁ = 2776 cm^-1, v″₄ = 2706 cm^-1, and v″₆ = 586 cm^-1.

Original language	English
Pages (from-to)	66-72
Number of pages	7
Journal	The Journal of chemical physics
Volume	95
Issue number	1
DOIs	https://doi.org/10.1063/1.461786
State	Published - 1 Jul 1991

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@article{09ae7ba2ee4146abab2d9ae9479319f8,

title = "Vibronic analysis of the {\~A}2A1-{\~X} 2E laser-induced fluorescence of jet-cooled CH3S",

abstract = "The methylthio (CH3S) radical has been formed by KrF laser photolysis of dimethyl disulfide (CH3SSCH3) in a free-jet expansion. The {\~A}2A1←-{\~X}2E laser-induced fluorescence excitation spectrum was obtained in the wavelength region 350-382 nm. The origin lies at 26 526.3 cm-1 and the spin-orbital splitting for {\~X} (2E 3/2 and 2E1/2) was determined to be -259.1 cm-1 Several progressions indicated that v′2 -1098 ±2, v′3 = 401 ± 2 cm-1 and (with less certainty) v′6 = 635 ±10 cm-1. The predissociation threshold was estimated to be slightly above 28 016 cm-1, ∼ 1490 cm-1 above the v′ = 0 level of the A state. The dispersed fluorescence was observed in the 363-530 nm region. The main progressions give v″2 = 1313 ±5 cm-1, v″3 = 727 ±3 cm-1, and v″5 = 1496 ± 6 cm-1. Weaker lines are also consistent with some possible vibrational frequencies v″1 = 2776 cm-1, v″4 = 2706 cm-1, and v″6 = 586 cm-1.",

author = "Chiang, {Su Yu} and Yuan-Pern Lee",

year = "1991",

month = jul,

day = "1",

doi = "10.1063/1.461786",

language = "English",

volume = "95",

pages = "66--72",

journal = "The Journal of chemical physics",

issn = "0021-9606",

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T1 - Vibronic analysis of the Ã2A1-X̃ 2E laser-induced fluorescence of jet-cooled CH3S

AU - Chiang, Su Yu

AU - Lee, Yuan-Pern

PY - 1991/7/1

Y1 - 1991/7/1

N2 - The methylthio (CH3S) radical has been formed by KrF laser photolysis of dimethyl disulfide (CH3SSCH3) in a free-jet expansion. The Ã2A1←-X̃2E laser-induced fluorescence excitation spectrum was obtained in the wavelength region 350-382 nm. The origin lies at 26 526.3 cm-1 and the spin-orbital splitting for X̃ (2E 3/2 and 2E1/2) was determined to be -259.1 cm-1 Several progressions indicated that v′2 -1098 ±2, v′3 = 401 ± 2 cm-1 and (with less certainty) v′6 = 635 ±10 cm-1. The predissociation threshold was estimated to be slightly above 28 016 cm-1, ∼ 1490 cm-1 above the v′ = 0 level of the A state. The dispersed fluorescence was observed in the 363-530 nm region. The main progressions give v″2 = 1313 ±5 cm-1, v″3 = 727 ±3 cm-1, and v″5 = 1496 ± 6 cm-1. Weaker lines are also consistent with some possible vibrational frequencies v″1 = 2776 cm-1, v″4 = 2706 cm-1, and v″6 = 586 cm-1.

AB - The methylthio (CH3S) radical has been formed by KrF laser photolysis of dimethyl disulfide (CH3SSCH3) in a free-jet expansion. The Ã2A1←-X̃2E laser-induced fluorescence excitation spectrum was obtained in the wavelength region 350-382 nm. The origin lies at 26 526.3 cm-1 and the spin-orbital splitting for X̃ (2E 3/2 and 2E1/2) was determined to be -259.1 cm-1 Several progressions indicated that v′2 -1098 ±2, v′3 = 401 ± 2 cm-1 and (with less certainty) v′6 = 635 ±10 cm-1. The predissociation threshold was estimated to be slightly above 28 016 cm-1, ∼ 1490 cm-1 above the v′ = 0 level of the A state. The dispersed fluorescence was observed in the 363-530 nm region. The main progressions give v″2 = 1313 ±5 cm-1, v″3 = 727 ±3 cm-1, and v″5 = 1496 ± 6 cm-1. Weaker lines are also consistent with some possible vibrational frequencies v″1 = 2776 cm-1, v″4 = 2706 cm-1, and v″6 = 586 cm-1.

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Vibronic analysis of the Ã²A₁-X̃ ²E laser-induced fluorescence of jet-cooled CH₃S

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