Ra. Brownsword et G. Hancock, TIME-RESOLVED FTIR EMISSION STUDY OF PRODUCT DYNAMICS IN THE NO+NCO REACTION, Journal of the Chemical Society. Faraday transactions, 93(7), 1997, pp. 1279-1286
Citations number
37
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
Product IR chemiluminescence in the NO + NCO reaction has been recorde
d using time-resolved FTIR spectroscopy. Emission was observed from hi
ghly vibrationally excited CO2 and N2O, produced from two competing ch
annels and emitting in the Delta v(3) = -1 transitions between 2000-24
00 cm(-1). The spectra are consistent with both molecules having total
vibrational energies which are approximately equal to those predicted
from prior distributions, but the partitioning between the individual
vibrational modes is markedly non-statistical. In particular, CO2 exh
ibits much less excitation in nu(3) (estimated as 0.6 +/- 0.2 quanta p
er molecule) than statistically predicted. Emission from the (0, 0, 1)
levels of both CO2 and N2O was measured, and their relative intensiti
es and kinetic behaviour shown to be consistent with a model of relaxa
tion of the nascent vibrational distributions in which product-channel
branching ratios were taken to be equal to those previously determine
d from end-product analyses.