			15min:

HIGH RESOLUTION FTIR SPECTRA OF METHYL NITRITE AND ASSIGNMENT OF THE

₈ FUNDAMENTAL OF THE CIS CONFORMER.

LISA M. GOSS, Department of Chemistry, Idaho State University, Campus Box 8023, Pocatello ID, 83209; THOMAS A. BLAKE, Pacific Northwest National Laboratory, P. O. Box 999, Mail Stop K8-88, Richland, WA 99352.

The infrared spectrum of gas phase methyl nitrite (CH₃ONO) has been recorded at high resolution between 600 and 4000 cm^-1. The conformational doublets due to the cis and trans conformers are clearly separated in a number of the fundamentals. Previous work in the microwave has established that the barrier to rotation of the methyl group in the trans form is very low and the infrared bands observed in this study are very congested. The barrier in the cis conformer is much higher. The ₈ at 841 cm^-1 was assigned by previous workers to the N-O stretch of the cis conformer and is partially overlapped by the ₈ of the trans conformer. In this study, spectra taken at 0.0015 cm^-1 resolution on the PNNL IFS120/HR in a 20 cm cell were used to assign more than 800 A-type rovibrational lines of the cis ₈ between 815 and 865 cm^-1.