Ultraviolet photodissociation dynamics of methyl iodide at 333 nm

D. Howard Failbrother, K. A. Briggman, Eric Weitz, P. C. Stair

Research output: Contribution to journalArticle

43 Citations (Scopus)


The ultraviolet (UV) photodissociation dynamics of methyl iodide at 333.45 nm has been studied using resonantly enhanced multiphoton ionization in conjunction with a time-of-flight mass spectrometer (REMPI-TOFMS). At this wavelength methyl iodide photolysis involves a transition with significant parallel and perpendicular character. Both ground (I) and spin-orbit (I*) excited iodine result from a parallel transition to the 3Q 0 state. In contrast, the perpendicular transition, which most likely involves initial excitation to the 3 Q 1 state, leads exclusively to production of I. Based on data from this study, an upper limit for the conical intersection between the 3Q0 and 1Q1 potential surfaces is ∼30 500 cm-1.

Original languageEnglish
Pages (from-to)3787-3791
Number of pages5
JournalThe Journal of Chemical Physics
Issue number5
Publication statusPublished - 1994

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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