Laser-induced nitrogen oxide fluorescence from nitro compounds by 222 nm laser

Abstract

This paper presents the study results of the single-frequency interaction of KrCl laser broadband radiation with nitro compound vapors in the atmosphere. The optical method of a substance spectroscopic analysis including photofragmentation of a complex R–NO2 molecule followed by laser-induced fluorescence of vibrationally excited fragments of NO X2Π, v''>0 (PF-LIF) was studied in the experiments. It has been shown that R–NO2 molecules exposed to λ = 222 nm FWHM 0.3 nm KrCl laser broadband radiation undergo photofragmentation followed by resonant excitation of several electronic-vibrational levels of NO X2Π, v'' (2,4). At the same time, the concentration of fragmented NO X2Π, v'' (2,4) increases due to the secondary PF-LIF NO2 process during the nanosecond laser pulse.