Laser-induced dispersive fluorescence spectrum and the detection of NO2

Guiyin Zhang; Yidong Jin

doi:10.1117/12.758223

6 February 2008 Laser-induced dispersive fluorescence spectrum and the detection of NO₂

Guiyin Zhang, Yidong Jin

Proceedings Volume 6823, High-Power Lasers and Applications IV; 68231E (2008) https://doi.org/10.1117/12.758223
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

Laser-induced dispersive fluorescence (LIDF) spectrum of NO₂ molecule in the spectral region of 508.3-708.3nm is obtained with the 508.0nm excitation wavelength. It is found that at low sample pressure the spectrum is composed of a banded structure superimposed on a continuous one. While the spectrum show itself as a continuous envelope centered at 630.0nm when the pressure with a higher value. NO₂ molecules are excited to the first excited state A²B₂ by absorbing laser photons. Owing to the strong interaction between X²A₁~A²B₂ and A²B₂ ~ B²B₁states, some excited molecules redistribute to X²A₁ and B²B₁ states by the process of internal energy conversion or quenching. This induces the fluorescence come from different excited states. Based on the experimental data, the vibration frequencies of the ground electronic state of NO₂ molecule are obtained. They are ω₁=(1319±12)cm^-1, ω₂=(759.8±0.7)cm^-1,and ω₃=(1635±29)cm^-1. The optimum-receiving wavelength for detecting NO₂ gas with the technique of LIDF is proposed.

Citation Download Citation

Guiyin Zhang and Yidong Jin "Laser-induced dispersive fluorescence spectrum and the detection of NO₂", Proc. SPIE 6823, High-Power Lasers and Applications IV, 68231E (6 February 2008); https://doi.org/10.1117/12.758223

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