			15min:

UV-VISIBLE TRANSITION STRENGTHS OF THE HALOGENS IN THE GAS PHASE AND IN INERT LIQUID SOLVENTS.

J. TELLINGHUISEN, R. IAN GRAY AND K. M. LUCKETT, Department of Chemistry, Vanderbilt University, Nashville, TN 37235.

The UV-visible absorption spectra of the homonuclear halogens involve three electronic bands -- A-X, B-X, and B'(1_u)-X. It has long been known that the absorption in inert solvents is stronger than that in the

gas phase by 20-30 I₂ and Br₂ in CCl₄ and n-heptane are recorded at temperatures from 15 C to 50 C and are decomposed into component bands by least-squares analysis. The results of this analysis show: (1) the A-X

band strength is the same within ~5 increased absorption strength in the liquid phase is attributable mostly

if not entirely to the B'-X transition. The reasons for this behavior are under investigation.