Electronically Excited NO by Photodissociation of NO2 and NOCl

Abstract

The photodissociations of NO₂ and NOCl yielding electronically excited NO are observed by the fluorescence of NO(γ) and NO(β) bands: $$\begin{array}{c}{\mathrm{NO}}_2\to {\displaystyle {lim}_{\mathrm{h\nu }}}\mathrm{NO}{\mathrm{(A}}^2{\Sigma }^{+}\text{;v=0)+}\mathrm{O}{(}^3\mathrm{P),}\\ {\mathrm{NO}}_2\to {\displaystyle {lim}_{\mathrm{h\nu }}}\mathrm{NO}{\mathrm{(B}}^2\text{Π;v=0,1,2,3)+}\mathrm{O}{(}^3\mathrm{P),}\\ \mathrm{NOCl}\to {\displaystyle {lim}_{\mathrm{h\nu }}}\mathrm{NO}{\mathrm{(A}}^2{\Sigma }^{+}\text{;v=0,1,2)+}\mathrm{Cl}{(}^2{P}^0\mathrm{).}\end{array}$$ The dissociations of NO₂ are observed at wavelengths 1165, 1236, and 1295 Å but not at 1470 Å and longer wavelengths, and the dissociation of NOCl is found at wavelengths from 1165 Å up to about 1600 Å. The NO(A ²Σ⁺) and NO(B ²Π) molecules from NO₂ and NOCl are strongly rotationally excited.