			15min:

STATE-TO-FIELD VIBRATIONAL ENERGY TRANSFER FROM S₁ PARA -DIFLUOROBENZENE IN COLLISIONS WITH SEVERAL INERT GAS PARTNERS..

T. A. STONE, D. L. CATLETT AND C. S. PARMENTER, Indiana University Department of Chemistry, Bloomington, Indiana 47405.

State-to-field vibrational energy transfer (VET) from several levels within the S₁ (¹B_2u) manifold of para -Difluorobenzene ( p DFB) vapor at 300 K in collisions with a series of gases is currently being examined. Vibrational relaxation by collisions with He, Ne, Ar, Kr, and Xe from three initial levels with vibrational energies ranging to 1634 cm^-1 is probed. The resulting fluorescence spectra allow for the determination of absolute rate constants and cross sections for the collisional transfer of vibrational energy into the surrounding S₁ vibronic field of states.