Fast beam studies of NCO free radical photodissociation
The Journal of Chemical Physics, ISSN: 0021-9606, Vol: 97, Issue: 7, Page: 4937-4947
1992
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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.
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