Photofragment ion imaging from mass-selected Mg+BrCH3 complex: Dissociation mechanism following photoinduced charge transfer

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We have observed fragment ion images produced by ultraviolet photodissociation of Mg+BrCH3 complex ions using a reflectron time-of-flight mass spectrometer combined with an imaging detector. The BrCH3+ fragment ion was produced after the 266-nm excitation of Mg+BrCH3. In the image of the BrCH3+ ions, a split distribution was observed parallel to the polarization direction of the photolysis laser. In calculated potential energy curves, we found a repulsive potential correlated with a dissociation limit of Mg + BrCH3+: The calculation results indicate that the dissociation and the charge transfer occurred via non-adiabatic process after the 52A′ ← 12A′ photoexcitation. The obtained energy and angular distributions of BrCH3+ photofragments were consistent with the fast BrCH3+ formation process on the repulsive potential energy curve.

Original languageEnglish
Article number024301
JournalJournal of Chemical Physics
Issue number2
Publication statusPublished - 2017 Jan 14

ASJC Scopus subject areas

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

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