			15min:

ELECTRONIC SPECTROSCOPY OF THE A¹A''-X¹A^ / SYSTEM OF CHCl AND CDCl.

C. TAO, M. DESELNICU, C. MUKARAKATE AND S. A. REID, Department of Chemistry, Marquette University, Milwaukee, WI 53201-1881.

We report a comprehensive new study of the electronic spectroscopy of the A¹A''-X¹A' system of CH³⁵Cl, CH³⁷Cl, CD³⁵Cl and CD³⁷Cl in the region 450-750 nm. For each isotopomer, cold bands in the progressions 2₀ⁿ, 2₀ⁿ3₀^m (m=1-2), 1₀¹2₀ⁿ, and 1₀¹2₀ⁿ3₀^m (m=1-2) were observed. The spectra were measured under jet-cooled conditions using a pulsed discharge source, and rotationally analyzed to yield precise values for the band origins and rotational constants. The derived A¹A'' state vibrational intervals are combined in Dixon plots with previous experimental results^,^,^, to derive barriers to linearity for the 2ⁿ progression. The A¹A'' C-H (C-D) stretching frequency was determined for the first time, and the observed ₂ and ₃ dependence of the CH(D)³⁵Cl-CH(D)³⁷Cl isotope splitting in the A¹A'' state is investigated.