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Fast beam studies of NCO free radical photodissociation

The Journal of Chemical Physics, ISSN: 0021-9606, Vol: 97, Issue: 7, Page: 4937-4947
1992
  • 63
    Citations
  • 0
    Usage
  • 8
    Captures
  • 0
    Mentions
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Metrics Details

  • Citations
    63
    • Citation Indexes
      63
  • Captures
    8

Article Description

The spectroscopy and dissociation dynamics of the NCO radical have been investigated by applying fast radical beam photodissociation spectroscopy to the B̃Π←X̃Π electronic transition. Measurements of the photodissociation cross section as a function of dissociation wavelength show that even the lowest vibrational levels of the B̃Π state predissociate. Analysis of fragment kinetic energy release reveals that the spin-forbidden N(S)+CO( Σ) products are produced exclusively until 20.3 kcal/mol above the origin, at which point, the spin-allowed N(D)+CO product channel becomes energetically accessible. The spin-allowed channel dominates above this threshold. By determining the location of this threshold, we obtain a new ΔH for NCO of 30.5±1 kcal/mol, several kcal/mol lower than the previously accepted value. © 1992 American Institute of Physics.

Bibliographic Details

D. R. Cyr; R. E. Continetti; R. B. Metz; D. L. Osborn; D. M. Neumark

AIP Publishing

Physics and Astronomy; Chemistry

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