Two-Color Resonant Four-Wave Mixing Spectra of the C2∑+-X2II(1-1) Band of CH in a Flame

Xinghua Li; Awadhesh Kumar; Chih Chang Hsiao; Yuan-Pern Lee

doi:10.1021/jp991027b

Two-Color Resonant Four-Wave Mixing Spectra of the C²∑⁺-X²II(1-1) Band of CH in a Flame

Xinghua Li, Awadhesh Kumar, Chih Chang Hsiao, Yuan-Pern Lee^*

^*Corresponding author for this work

Department of Applied Chemistry

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

18 Scopus citations

Abstract

We investigated predissociative transitions C²∑⁺ (v′ = 1)-X²II (v″ = 1) of CH in an oxyacetylene flame with the two-color resonant four-wave mixing technique in which two grating beams are in resonance with the C-X transition and the probe beam is resonant with a selected A-X transition. Six branches of the C-X system are spectrally resolved for the first time; in total 124 lines detected in this work correspond to excitation of the C state up to N′ = 23. Observed wavenumbers are fitted to yield improved spectral parameters of the C²∑⁺ (v = 1) state; one additional centrifugal distortion parameter L_v is evaluated significantly. These data are combined with lines of C-X (0-0) and (2-2) bands to provide improved characterization of the C state of CH. For all lines of the C-X (1-1) band, the line widths are nearly identical. Predissociation mechanisms of the C state are discussed.

Original language	English
Pages (from-to)	6162-6166
Number of pages	5
Journal	Journal of Physical Chemistry A
Volume	103
Issue number	31
DOIs	https://doi.org/10.1021/jp991027b
State	Published - 1 Dec 1999

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@article{ef9e939290f3492db537b05f0ab48a14,

title = "Two-Color Resonant Four-Wave Mixing Spectra of the C2∑+-X2II(1-1) Band of CH in a Flame",

abstract = "We investigated predissociative transitions C2∑+ (v′ = 1)-X2II (v″ = 1) of CH in an oxyacetylene flame with the two-color resonant four-wave mixing technique in which two grating beams are in resonance with the C-X transition and the probe beam is resonant with a selected A-X transition. Six branches of the C-X system are spectrally resolved for the first time; in total 124 lines detected in this work correspond to excitation of the C state up to N′ = 23. Observed wavenumbers are fitted to yield improved spectral parameters of the C2∑+ (v = 1) state; one additional centrifugal distortion parameter Lv is evaluated significantly. These data are combined with lines of C-X (0-0) and (2-2) bands to provide improved characterization of the C state of CH. For all lines of the C-X (1-1) band, the line widths are nearly identical. Predissociation mechanisms of the C state are discussed.",

author = "Xinghua Li and Awadhesh Kumar and Hsiao, {Chih Chang} and Yuan-Pern Lee",

year = "1999",

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doi = "10.1021/jp991027b",

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T1 - Two-Color Resonant Four-Wave Mixing Spectra of the C2∑+-X2II(1-1) Band of CH in a Flame

AU - Li, Xinghua

AU - Kumar, Awadhesh

AU - Hsiao, Chih Chang

AU - Lee, Yuan-Pern

PY - 1999/12/1

Y1 - 1999/12/1

N2 - We investigated predissociative transitions C2∑+ (v′ = 1)-X2II (v″ = 1) of CH in an oxyacetylene flame with the two-color resonant four-wave mixing technique in which two grating beams are in resonance with the C-X transition and the probe beam is resonant with a selected A-X transition. Six branches of the C-X system are spectrally resolved for the first time; in total 124 lines detected in this work correspond to excitation of the C state up to N′ = 23. Observed wavenumbers are fitted to yield improved spectral parameters of the C2∑+ (v = 1) state; one additional centrifugal distortion parameter Lv is evaluated significantly. These data are combined with lines of C-X (0-0) and (2-2) bands to provide improved characterization of the C state of CH. For all lines of the C-X (1-1) band, the line widths are nearly identical. Predissociation mechanisms of the C state are discussed.

AB - We investigated predissociative transitions C2∑+ (v′ = 1)-X2II (v″ = 1) of CH in an oxyacetylene flame with the two-color resonant four-wave mixing technique in which two grating beams are in resonance with the C-X transition and the probe beam is resonant with a selected A-X transition. Six branches of the C-X system are spectrally resolved for the first time; in total 124 lines detected in this work correspond to excitation of the C state up to N′ = 23. Observed wavenumbers are fitted to yield improved spectral parameters of the C2∑+ (v = 1) state; one additional centrifugal distortion parameter Lv is evaluated significantly. These data are combined with lines of C-X (0-0) and (2-2) bands to provide improved characterization of the C state of CH. For all lines of the C-X (1-1) band, the line widths are nearly identical. Predissociation mechanisms of the C state are discussed.

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ER -

Two-Color Resonant Four-Wave Mixing Spectra of the C²∑⁺-X²II(1-1) Band of CH in a Flame

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