Vibrational relaxation in ground state p-difluorobenzene: Single level preparation by stimulated emission pumping

Warren D. Lawrance, Alan E.W. Knight

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We have measured the cross section for vibrational relaxation from the 52302 level (εvib = 2036 cm−1) of S0 p‐difluorobenzene (pDFB) due to pDFB‐pDFB collisions. Stimulated emission pumping has been used to selectively populate the 52302 level. Single vibronic level fluorescence from the S1 level 302, generated by exciting the 5023022 transition at a variable delay time after 52302 has been populated, has been used to monitor the population dynamics of 52302. We obtain a value of 4±1×107s−1 Torr−1 for the vibrational relaxation rate coefficient, a value which is 2–3 times the hard sphere value. This large cross section is consistent with the cross sections observed in S1 benzene but is an order of magnitude larger than the cross sections observed previously for a variety of molecules in the ground electronic state. (AIP)
Original languageEnglish
Pages (from-to)570-571
Number of pages2
JournalThe Journal of Chemical Physics
Volume77
Issue number1
DOIs
Publication statusPublished - 1 Jul 1982
Externally publishedYes

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