15min:

G. LI, J.-G. WANG AND P. F. BERNATH, Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.

BaS molecules were synthesized using a Broida-type oven and detected by laser excitation spectroscopy using a single mode Ti:Sapphire laser. High resolution spectra of BaS were recorded in the 12200-12765 cm^-1 region. The BaS spectra contain several bands, and preliminary assignments and least-squares fits were carried out using ground state microwave data. The main bands are provisionally assigned to the A¹ -X^{1 +} transition of BaS. Further analysis of the minor isotopologues will be performed in order to obtain a secure vibrational assignment of the upper state levels. More laser scans will also be carried out from 12200 cm^-1 to the lower frequency limit of the Ti:Sapphire laser. Preliminary results on this ongoing project will be presented.