Cavity Ringdown Spectroscopy of PH2 Radical in 465–555 nm

Absorption spectra of jet-cooled PH2 radicals were recorded in the wavelength range of 465–555 nm using cavity ringdown spectroscopy. The PH2 radicals were produced in a supersonic jet by pulsed direct current discharge of a mixture of PH3 and SF6 in argon. Seven vibronic bands with fine rotational...

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Bibliographic Details
Published inChinese journal of chemical physics Vol. 24; no. 1; pp. 8 - 15
Main Authors Zhao, Dong-feng, Qin, Cheng-bing, Zhang, Qun, Chen, Yang
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.02.2011
Subjects
PH2 radical
DC discharge
Cavity ringdown spectroscopy
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Summary:Absorption spectra of jet-cooled PH2 radicals were recorded in the wavelength range of 465–555 nm using cavity ringdown spectroscopy. The PH2 radicals were produced in a supersonic jet by pulsed direct current discharge of a mixture of PH3 and SF6 in argon. Seven vibronic bands with fine rotational structures have been observed and assigned as 00 0, 2 n 0, and 2 n 1 (n = 1–3) bands of the Ã2A1− X̃2B1 electronic transition. Rotational assignments and rotational term values for each band were re-identified, and the molecular parameters including rotational constants, centrifugal distortion constants, and spin-rotation interaction constants were also improved with reasonably high precision. In addition, large perturbations observed in each quantum number of total angular momentum of the a axis level of the excited vibronic states were briefly discussed.
ISSN:1674-0068
2327-2244
DOI:10.1088/1674-0068/24/01/8-15