Laser-induced Fluorescence of PO Photofragments of Organophosphates

The spectrum of phosphorus monoxide (PO) fluorescence is calculated. It is shown that the use of excitation radiation at wavelengths near the bandheads of the ( P 22 + Q 12 ) and P 12 branches of the A 2 Σ + ( v ′ = 0) − X 2 Π 3/2 ( v ′′ = 0) band provides a spectral separation of the γ (0, 1) PO fluorescence band and the vibrational–rotational Raman spectrum of oxygen. The spectra of the γ (0, 1) fluorescence band of PO fragments of dimethylmethylphosphonate and the vibrational-rotational band of spontaneous Raman scattering on atmospheric oxygen molecules are experimentally obtained under exposure to KrF-laser radiation at a wavelength of 247.78 nm. It is shown that the shape and position of the fluorescence spectra calculated agree well with the experimental data.