15min:
DIODE LASER SPECTROSCOPY OF SD3+.

MARIA M. SANZ, CHANGHONG XIA AND STEPHEN C. FOSTER, Department of Chemistry, Mississippi State University, Mississippi State, MS 39762-9573.

Three of the four fundamental bands of the SH+3 ion were observed by Amano et al. Much less is known about the fully-deuterated isomer, SD+3. An ab initio calculation by Botschwina et al. predicted the nu1 and nu3 band origins at 1832 and 1839 cm-1 respectively, but there have been no previous experimental observations of this isomer.

In this talk we will discuss our observation of the absorption spectrum of SD3+ in the region between 1750-1870 cm-1. The ion was generated in a methanol-cooled hollow cathode discharge of D2, containing a trace quantity of OCS, and a series of spectra were recorded by means of a diode laser system. The nu1 and nu3 fundamentals of this ion perturb each other via a Coriolis interaction and a full analysis requires us to simultaneously fit both bands. The analysis is currently in progress, and our results will be discussed at this meeting.