Supersonic Jet-cooled Laser-induced Fluorescence(LIF) Spectrum of Biacetyl

Abstract

Abstract: The laser-induced fluorescence(LIF) excitation spectra of biacetyl in the range of 432—451 nm were obtained under the supersonic jet condition. Three weaker peaks, which are at 0, 87 and 98 cm^-1, respectively(related to 22182 cm^-1) were observed in a high sensitivity spectrum at red-hand of 22336 cm^-1 peak which was assigned as band origin previously. The tunnel splits for 87 and 97 cm^-1 peaks were observed in the hyperfine spectra. They are 1.04 cm^-1 and 1.68 cm^-1 for 87 cm^-1 peak and 97 cm^-1 peak respectively. These values are in agreement with calculated values very well. The band origin of S₁←S₀ transition is now determined at 22182 cm^-1. Acomplete assignment of biacetyl LIFspectrum is done for the first time. The frequency of torsion mode is determined to be 91.1 cm^-1 , and the enharmonic constant is 4.875 cm^-1.

Key words: Laser-induced fluorescence, Biacetyl, Supersonic jet cooling, Spectrum

CLC Number:

O561.3

TrendMD:

PEI Lin-Sen, CHEN Yang, JIN Jin, GAO Yi-De, DAI Jing-Hua, CHEN Cong-Xiang . Supersonic Jet-cooled Laser-induced Fluorescence(LIF) Spectrum of Biacetyl[J]. Chem. J. Chinese Universities, 2000, 21(7): 1093.

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Supersonic Jet-cooled Laser-induced Fluorescence(LIF) Spectrum of Biacetyl

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