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.
Methyl nitrite (CH3ONO) contains a mixture of cis and trans rotational isomers. As in the 8 and 9 vibrations of the cis form, the 3 vibration is not too congested, consistent with the high barrier to rotation of the methyl group in the cis form. The 3, with an origin at 1620. cm -1, has been assigned by previous workers to the N=O stretch of the cis conformer and hot bands are also present in this region. In this study, a spectrum taken at 0.0015 cm -1 resolution on the PNNL IFS120/HR in a 20 cm cell was used to assign more than 300 A-type transitions of the cis 3 between 1600 and 1650 cm -1 and a set of excited state constants was determined.