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ANDREW J. MARR AND TREVOR J. SEARS, Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973-5000.

The A¹A'' (0,1,0) <- X¹A' (0,0,0) electronic band system of DCBr has been measured in the region 11\,720\,cm^-1 to 11\,780\,cm^-1. Spectra were recorded using a transient absorption frequency modulation Ti:Sapphire spectrometer incorporating a multipass Herriott-type cell for increased sensitivity. The (K=0<- K=1) and (K=1<- K=0) sub-bands of both isotopomers, DC⁸¹Br and DC⁷⁹Br, have been assigned and spectroscopic parameters determined. Transitions involving levels from higher K states are visible but their assignments are complicated by a variety of perturbations (vibronic, spin-orbit, coriolis, fermi resonance) involving the two singlet states and a background triplet state.

Acknowledgements :

The work was carried out at Brookhaven National Laboratory under Contract No. DE-AC02- 76CH00016 with the U.S. Department of Energy and supported by its Division of Chemical Sciences, Office of Basic Energy Sciences.