Mechanism of NO2 Photodissociation in the Energy-Deficient Region at 404.7 nm

Article abstract of DOI:10.1021/j100309a006

The photodissociation of NO2 for λ > λ_diss (397.9 nm) was restudied in view of the observed temperature dependence of its absorption cross section in the 404.7-nm region.It is hypothesized that the cross section for vibrationally excited molecules of NO2 is greater than that for vibrationless molecules.This leads to the conclusion that NO2 molecules excited in the energy-deficient region at 404.7 nm, which photodissociate, derive the required energy not only from rotational excitation as suggested in earlier studies but also from vibrational excitation.Use of this hypothesis leads to a reasonable fit of experimental and theoretical estimates of the quantum yields of NO2 photodissociation at 404.7 nm as a function of temperature.