10min:

H. FAN, I. IONESCU, C. ANNESLEY AND S. A. REID, Department of Chemistry, Marquette University, Milwaukee, WI 53233.

We report new measurements of the laser induced fluorescence spectra of the HCCl A¹A''-X¹A'system in the 515-615 nm region. The spectra were obtained under jet-cooled conditions using a pulsed discharge source. The pure bending transitions 2₀ⁿ with n=5-8 and combination bands 2₀ⁿ3₀^m with n=4-6 and m=1,2 have been measured and the rotational structure fit to a asymmetric top Hamiltonian, which yielded precise values for the band origins and effective rotational constants. Consistent with previous work, only sub-bands with K_a' = 0 appear strongly in the spectra. Fluorescence lifetimes were measured for rotational levels in each band, and the energy dependence of the lifetimes will be discussed.