15min:
HIGH RESOLUTION SPECTROSCOPY OF Ar-CH4 IN THE 7 µ REGION.

I. PAK, M. HEPP, D. A. ROTH, G. WINNEWISSER, I. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany; D. SCOUTERIS, B. J. HOWARD, Physical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, United Kingdom; K. M. T. YAMADA, National Institute for Advanced Interdisciplinary Research (NAIR), Higashi 1-1-4, Tsukuba, Ibaraki 305, Japan.

The absorption spectrum of the Ar-CH4 van der Waals complexes was measured in the 7 µ 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 were observed in the spectral region 1310.5--1311.1 cm-1 near the R(0) line of the nu4 fundamental band of the methane monomer. The observed transitions are related to the j=1 <- 0 transition of the CH4 in the complex. Analysis of the data is in progress, and the results of the analysis will be presented at the conference.