A reanalysis of the A 1A"-X 1A' transition of CFBr.

ABSTRACT

The laser induced fluorescence spectrum of the A (1)A(")-X (1)A(') transition of CFBr is presented, with selected bands recorded at sub-Doppler resolution, allowing the rotational constants to be fully determined. Analysis of dispersed fluorescence spectra and the pattern of (79)Br/(81)Br isotope splittings indicate that the origin must be shifted from previous assignments in the literature to 23 271.0 cm(-1). This implies that only the lowest four vibrational levels in the A state have significant quantum yields for fluorescence, with all other levels strongly predissociated. Comparison with photofragment measurements implies that the A state is metastable, with a barrier to dissociation of approximately 1000 cm(-1).