Journal of Physical Chemistry p. 6184 - 6189 (1986)
Update date:2022-08-17
Topics:
Spiglanin, Thomas A.
Perry, Robert A.
Chandler, David W.
The heat of formation (ΔHf(298 K)) of HNCO is determined to be -24.9+0.7-2.8 kcal/mol (based on ΔHf(NH) = 85.2 kcal/mol).This value is obtained by measuring the threshold for the production of NH(a1Δ) and by determining the energy contents of the NH fragment and the CO cofragment produced by photolysis of HNCO at wavelengths near the threshold.Saturated laser-induced fluorescence is used to determine the internal state distribution of NH(a1Δ), and multiphoton ionization is used to measure the internal state distribution of CO.An upper limit for the branching ratio of NCO/NH production from photodissociation of HNCO at 193 nm is determined from an analysis of kinetic experiments to be 0.10.To clarify the mechanism of photodissociation, HNCO fluorescence-excitation and NH(a1Δ) action spectra are also measured.They imply that two excited states of HNCO are present where only one had previously been considered.
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