			15min:

SUB-DOPPLER SPECTROSCOPY OF THE A¹B₁ - X¹A₁ ELECTRONIC TRANSITION OF CBr₂.

EYAD H AL-SAMRA AND COLIN WESTERN, School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, UK.

Sub-Doppler spectra of selected bands of the A¹B₁ - X¹A₁ transition of CBr₂ are presented allowing all three rotational constants to be determined for the zero point level of the ground state for the first time. Refined rotational constants are presented for various A state vibrational levels, and an additional progression is identified in the A-X absorption spectrum. The assignment of this progresion was assisted by modelling Franck-Condon factors with the pgopher program.