Collision-Induced Dissociation of Highly Excited NO2 in the Gas Phase and on MgO (100) Surfaces

A. Sanov, D. W. Arnold, M. Korolik, H. Ferkel, C. R. Bieler, C. Capellos, C. Wittig, Hanna Reisler

Research output: Contribution to journalArticlepeer-review


Collision-induced dissociation (CID) of NO2 in highly excited mixed 2A1/2B2 states is studied in crossed molecular beams at collision energies of ∼2000 cm-1 and on crystalline MgO(100) at collision energies of ∼2000 and 4400 cm-1. The yield spectra obtained by scanning the excitation laser wavelength while monitoring NO fragments show features identical to those in the fluorescence excitation spectrum of NO2, but the yield of CID decreases exponentially with the increase of the amount of energy required to reach the threshold for the monitored NO state. The results are discussed in terms of a mechanism in which highly excited NO2 undergoes further activation by collisions, followed by unimolecular decomposition. The NO product spin-orbit excitations are sensitive to the chemical identity of the collider and bear the imprints of exit-channel interactions, which are more significant on the MgO(100) surface than in the gas-phase.

Original languageEnglish (US)
Pages (from-to)291-303
Number of pages13
JournalACS Symposium Series
StatePublished - 1997

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


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