State-to-state vibrational energy transfer in acetylene gas, measured by fluorescence-detected Raman-ultraviolet double resonance spectroscopy

B. L. Chadwick, A. P. Milce, B. J. Orr*

*Corresponding author for this work

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Fluorescence-detected Raman-ultraviolet double resonance spectroscopy enables state-selective investigations of vibrational energy transfer in gas-phase acetylene, C2H2. Pulsed coherent Raman excitation of the (ν2 + ν4 - ν4) rovibrational hot band of C2H2(g) is followed by rovibronic probing of collision-induced population transfer to the ν2 vibrational level. This time-resolved spectroscopic technique provides novel kinetic and mechanistic information on the quasi-elastic intermolecular VV transfer process: C2H22 + ν4) + C2H2(ν = 0) → C2H22) + C2H24). The state-to-state second-order rate constant for this process is measured and its relevance to the dynamics of vibrational energy transfer is discussed. The results demonstrate the advantages of rotationally resolved double-resonance tecniques in elucidating vibrational energy transfer processes.

Original languageEnglish
Pages (from-to)113-125
Number of pages13
JournalChemical Physics
Volume175
Issue number1
DOIs
Publication statusPublished - 1 Sep 1993

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