The dynamics of NO radical formation in the UV 266Â nm photodissociation of nitroethane

Photodissociation of gaseous nitroethane at 266 nm has been studied by monitoring the NO(X2Π) product using laser-induced fluorescence technique. Rotational state distributions of the NO(X2Π1/2 and X2Π3/2, v″ = 0) photofragment have been measured and characterized by Boltzmann temperature of 810 ± 100 K. Only the NO photoproduct in v″ = 0 state can be observed in the present work. The geometries of the nitroethane, the ethyl nitrite and the transition state connecting the two isomeric structures have been investigated using ab initio method. The photodissociation dynamics of nitroethane is discussed on the basis of experimental observation and calculation results.