Vibronic analysis of the Ã→X̃ laser-induced fluorescence of jet-cooled methoxy (CH3O) radical

Yin Yu Lee; Gwo Huei Wann; Yuan-Pern Lee

doi:10.1063/1.465481

Vibronic analysis of the Ã→X̃ laser-induced fluorescence of jet-cooled methoxy (CH₃O) radical

Yin Yu Lee^*, Gwo Huei Wann, Yuan-Pern Lee

^*Corresponding author for this work

Department of Applied Chemistry

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

47 Scopus citations

Abstract

The dispersed fluorescence of the Ã ²A₁-X̃ ²E system of CH₃O and ¹³CH₃O in a supersonic jet was recorded after excitation of various vibrational levels of the A state. Analysis of the spectra yielded v″₂ = 1412, v″₃ = 1047, v″5 = 1494, and v″₆ = 653 cm^-1 for the X̃ state of ¹²CH₃O, and v″₂ = 1408, v″₃ = 1027, v″5 = 1488, and v″6 = 649 cm^-1 for ¹³CH₃O. The least-squares fitting of the observed 3₀⁰-3 ₆⁰ lines (with spin-orbit splitting removed) yielded ω_e=1057±3 cm^-1 and ω_ex _e =7.0±0.7 cm^-1 for v″₃ of ¹²CH₃O. Several tentative assignments were also made on the basis of the improved fluorescence spectra. The Fermi-resonant levels 1289 and 1319 cm^-1 above v=0 of the Ã state were also reassigned; the former is better represented as v′₂ = 1, whereas the latter is represented as v′₃ = 2.

Original language	English
Pages (from-to)	9465-9471
Number of pages	7
Journal	The Journal of chemical physics
Volume	99
Issue number	12
DOIs	https://doi.org/10.1063/1.465481
State	Published - 15 Dec 1993

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@article{3499965bad194377963eb151cf48fe56,

title = "Vibronic analysis of the {\~A}→{\~X} laser-induced fluorescence of jet-cooled methoxy (CH3O) radical",

abstract = "The dispersed fluorescence of the {\~A} 2A1-{\~X} 2E system of CH3O and 13CH3O in a supersonic jet was recorded after excitation of various vibrational levels of the A state. Analysis of the spectra yielded v″2 = 1412, v″3 = 1047, v″5 = 1494, and v″6 = 653 cm-1 for the {\~X} state of 12CH3O, and v″2 = 1408, v″3 = 1027, v″5 = 1488, and v″6 = 649 cm-1 for 13CH3O. The least-squares fitting of the observed 300-3 60 lines (with spin-orbit splitting removed) yielded ωe=1057±3 cm-1 and ωex e =7.0±0.7 cm-1 for v″3 of 12CH3O. Several tentative assignments were also made on the basis of the improved fluorescence spectra. The Fermi-resonant levels 1289 and 1319 cm-1 above v=0 of the {\~A} state were also reassigned; the former is better represented as v′2 = 1, whereas the latter is represented as v′3 = 2.",

author = "Lee, {Yin Yu} and Wann, {Gwo Huei} and Yuan-Pern Lee",

year = "1993",

month = dec,

day = "15",

doi = "10.1063/1.465481",

language = "English",

volume = "99",

pages = "9465--9471",

journal = "The Journal of chemical physics",

issn = "0021-9606",

publisher = "American Institute of Physics",

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T1 - Vibronic analysis of the Ã→X̃ laser-induced fluorescence of jet-cooled methoxy (CH3O) radical

AU - Lee, Yin Yu

AU - Wann, Gwo Huei

AU - Lee, Yuan-Pern

PY - 1993/12/15

Y1 - 1993/12/15

N2 - The dispersed fluorescence of the Ã 2A1-X̃ 2E system of CH3O and 13CH3O in a supersonic jet was recorded after excitation of various vibrational levels of the A state. Analysis of the spectra yielded v″2 = 1412, v″3 = 1047, v″5 = 1494, and v″6 = 653 cm-1 for the X̃ state of 12CH3O, and v″2 = 1408, v″3 = 1027, v″5 = 1488, and v″6 = 649 cm-1 for 13CH3O. The least-squares fitting of the observed 300-3 60 lines (with spin-orbit splitting removed) yielded ωe=1057±3 cm-1 and ωex e =7.0±0.7 cm-1 for v″3 of 12CH3O. Several tentative assignments were also made on the basis of the improved fluorescence spectra. The Fermi-resonant levels 1289 and 1319 cm-1 above v=0 of the Ã state were also reassigned; the former is better represented as v′2 = 1, whereas the latter is represented as v′3 = 2.

AB - The dispersed fluorescence of the Ã 2A1-X̃ 2E system of CH3O and 13CH3O in a supersonic jet was recorded after excitation of various vibrational levels of the A state. Analysis of the spectra yielded v″2 = 1412, v″3 = 1047, v″5 = 1494, and v″6 = 653 cm-1 for the X̃ state of 12CH3O, and v″2 = 1408, v″3 = 1027, v″5 = 1488, and v″6 = 649 cm-1 for 13CH3O. The least-squares fitting of the observed 300-3 60 lines (with spin-orbit splitting removed) yielded ωe=1057±3 cm-1 and ωex e =7.0±0.7 cm-1 for v″3 of 12CH3O. Several tentative assignments were also made on the basis of the improved fluorescence spectra. The Fermi-resonant levels 1289 and 1319 cm-1 above v=0 of the Ã state were also reassigned; the former is better represented as v′2 = 1, whereas the latter is represented as v′3 = 2.

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U2 - 10.1063/1.465481

DO - 10.1063/1.465481

M3 - Article

AN - SCOPUS:0000514319

SN - 0021-9606

VL - 99

SP - 9465

EP - 9471

JO - The Journal of chemical physics

JF - The Journal of chemical physics

IS - 12

ER -

Vibronic analysis of the Ã→X̃ laser-induced fluorescence of jet-cooled methoxy (CH₃O) radical

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