%A ZHANG Lian-shui;ZHANG Gui-yin;HAN Xiao-feng %T Self-Absorption of NO Fluorescence Induced by Two-Photon %0 Journal Article %D 2006 %J SPECTROSCOPY AND SPECTRAL ANALYSIS %R %P 925-927 %V 26 %N 05 %U {https://www.gpxygpfx.com/CN/abstract/article_2414.shtml} %8 2006-05-26 %X The two-photon LIDFS of NO excited with 452.4 nm output of an optical parameter generator and optical parameter amplifier pumped by a Nd:YAG laser was obtained. The vibration frequency and the inharmonic coefficients of the ground electronic state of NO were calculated from the results of the spectral ascription. They are ωe=(1 904.7±7.3) cm-1,ωeχe=(14.2±1.2) cm-1, and ωeye=-(0.021 8±0.009 1) cm-1 respectively. It was found for the first time that the intensity of the spectral lines departs from the Frank-Condon principle due to the self-absorption of NO molecules. The spectral line of A 2Σ(v′=0)→X 2Π(v″=0) transition disappears in the fluorescence spectra. But it appears gradually with decreasing the sample pressure and the distance from the laser-gas interaction volume to the receiving window. All of these provide an important reference for monitoring NO by the technique of laser-induced fluorescence.