15min:

PRADYOT K. CHOWDHURY, ANTHONY J. MERER AND SCOTT J. RIXON, Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver B.C. V6T 1Z1, Canada.

Astrophysical interest in CrH has motivated several studies of its A^{6 +} - X^{6 +} system. In this work, pulsed laser-induced fluorescence spectra of the (v',~0) bands with v' = 1, 2 and 3 have been recorded under supersonic jet-cooled conditions following reaction of laser-ablated chromium atoms with methanol. Because of the large rotational constant and the jet-cooling, only lines with N'' \leq 5 are appreciably intense. Satellite branches with N J, normally forbidden by Hund's case (b) selection rules, readily appear in all three bands as previously observed for the (0,0) band^a. Lines of the (2,0) and (3,0) bands are assigned here for the first time; strong perturbations considerably complicate the rotational structures of these bands.