VIBRATIONAL ENERGY TRANSFER IN PROPYNAL UNDER COLLISIONLESS CONDITIONSβˆ—CONDITIONS^{*}

Abstract

βˆ—^{*}Research carried out at Brookhaven National Laboratory under contract with the U.S. Department of Energy and supported by its Office of Basic Energy Sciences.Author Institution:Investigations of vibrational energy redistribution in the polyatomic, propynal - Hβˆ’C≑Cβˆ’C\HOH-C \equiv C-C^{O}_{\backslash_{H}} , will be discussed. Dye laser-induced, visible fluorescence following low-level vibrational excitation with a CO2CO_{2} laser is used to monitor the internal energy distribution under collisionless conditions (10βˆ’510^{-5} to 10βˆ’310^{-3} torr). Time resolved spectroscopic changes in Ξ½6\nu_{6} (C-C Stretch), the pumped mode, show that increases in population in the v=1 level follow closely the shape of the excitation pulse and that decay is exponential to 10 ΞΌs\mu_{s}. However, concomitant changes in hot bands of other modes, especially those of lower frequency, are not obvious. These results will be discussed in terms of intramolecular, V-V, and V-T energy transfer

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