Spectroscopic observation of vibrational Feshbach resonances in near-threshold photoexcitation of X-center dot CH3NO2 (X- = I- and Br-)

C E H Dessent, J Kim, M A Johnson

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Abstract

We report the observation of resonance structure in the absorption and X-/NO2- photofragment action spectra of the X- . CH3NO2 (X- = I- and Br-) complexes in the region above the electron detachment threshold. The resonance structure corresponds to peaks which appear at the onsets for vibrational excitation of the -NO2 wag, scissors, and stretch modes of neutral CH3NO2, the modes which most strongly distort upon electron capture into its pi* lowest unoccupied molecular orbital. We attribute the peaks to excitation of vibrational Feshbach resonances of the CH3NO2- transient negative ion, where near-threshold excitation of X- . CH3NO2 spectroscopically accesses states of the free electron-CH3NO2 system.

Original languageEnglish
Pages (from-to)395-406
Number of pages12
JournalFARADAY DISCUSSIONS
Issue number115
Publication statusPublished - 2000

Keywords

  • BOUND EXCITED-STATES
  • NEGATIVE-IONS
  • ASYMMETRIC SOLVATION
  • DIPOLE
  • MOLECULE
  • CLUSTERS
  • COMPLEX
  • ENERGY
  • PHOTODETACHMENT
  • NITROMETHANE

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