Laser-induced fluorescence of vibrationally excited nitric oxide by femtosecond laser pulse

Abstract

The fluorescence of nitric oxide excited molecules NO A2Σ occurring through two-color laser action on nitrogen dioxide NO2 has been studied. The NO2 pre-photofragmentation stage was carried out by a 355 nm ns laser pulse to obtain vibrationally excited NO X2Π, ν''(1) molecules. Subsequent femtosecond 472 nm laser pulse at an intensity of ∼300 GW/cm2 led to the induced fluorescence of NO A2Σ, ν′(0) as a result of two-photon resonance absorption by the NO A2Σ–X2Π, ν'ν'' (0,1) band.