Detection of Ar-CH4 Complexes in the 7μm Region by Diode Laser Spectroscopy

Author:

Pak I.1,Hepp M.1,Roth D.A.1,Winnewisser G.1,Yamada K.M.T.12

Affiliation:

1. I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln

2. National Institute for Advanced Interdisciplinary Research (NAIR), Higashi 1-1-4, Tsukuba, Ibaraki 305, Japan

Abstract

Abstract The absorption spectrum of the Ar-CH4 van der Waals complex was measured for the first time in the 7 μm region. The complexes were produced in a pulsed slit supersonic jet and detected by a tunable diode laser spectrometer with 40 MHz spectral resolution. The strongest absorption features of the Ar-CH4 complex were observed in the spectral region 1310.57-1311.05 cm -1 , located between the Q(l) and the R(0) lines of the ν4 fundamental band of the methane monomer. It was found that the newly detected absorption lines belong to three Q-branches of the Ar-CH4 complex. The transitions of these Q-branches are related to the Q(l) transition in the ν4 fundamental band of the methane molecule, which can rotate almost freely inside the complex. The three Q-branches have been assigned.

Publisher

Walter de Gruyter GmbH

Subject

Physical and Theoretical Chemistry,General Physics and Astronomy,Mathematical Physics

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