A-band methyl halide dissociation via electronic curve crossing as studied by electron energy loss spectroscopy

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Excitation of the A-band low-lying electronic states in the methyl halides, CH3I, CH3Br, CH3Cl, and CH3F, has been investigated for the (n ->sigma*) transitions, using electron energy loss spectroscopy (EELS) in the range of 3.5-7.5 eV. For the methyl halides, CH3I, CH3Br, and CH3Cl, three components of the Q complex ((3)Q(1), (3)Q(0), and (1)Q(1)) were directly observed, with the exception of methyl fluoride, in the optically forbidden EELS experimental conditions of this investigation. The effect of electronic-state curve crossing emerged in the transition probabilities for the (3)Q(0) and (1)Q(1) states, with spin-orbit splitting observed and quantified against results from recent ab initio studies. (C) 2010 American Institute of Physics. [doi:10.1063/1.3464483]
Original languageUnknown
Pages (from-to)054304
JournalJournal of Chemical Physics
Issue number5
Publication statusPublished - 1 Jan 2010

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