NO_2分子在440～495nm范围内的激光诱导荧光激发谱  

The 440-495 nm Laser-Induced Fluorescence Excitation Spectrum of NO_2

作　　者：张贵银[1] 张连水[1] 孙博[1] 韩晓峰[1] 

机构地区：[1]河北大学物理科学与技术学院

出　　处：《光谱学与光谱分析》2005年第6期854-856,共3页Spectroscopy and Spectral Analysis

基　　金：河北省自然科学基金项目(102090);华北电力大学青年科研基金项目(09320028)资助

摘　　要：以Nd :YAG脉冲激光器泵浦的光学参量发生器 放大器作激发光源,获得了室温、低气压条件下,NO2 分子在4 4 0～4 95nm波长范围内的激光诱导荧光激发谱,将所得谱线峰归属为NO2 由基电子态X2 A1 态向第二电子激发态B2 B1 态的跃迁,利用实验所得峰值波长计算了NO2 分子B2 B1 态的角振动频率ωe。通过对NO2 分子B2 B1 →X2 A1 跃迁的荧光时间分辨光谱进行实验研究,得到15Pa气压下B2 B1 (0 ,9,0 )振动态的能级寿命τ=4 9μs。测量了荧光寿命随气压的变化关系,利用曲线拟合得到NO2 B2 B1 (0 ,9,0 )振动态的自发辐射寿命τ0 ≈5 5 μs和无辐射跃迁弛豫速率常数。kq=1 2×10 - 9cm3molecule- 1 s- 1 。Under the conditions of room temperature and low pressure, laser-induced fluorescence excitation spectrum of NO in the wavelength region of 440-495 nm was obtained by using optical parameter generator (OPG) and amplifier (OPA) as an excitation source. The OPG/OPA was pumped by a Nd: YAG laser. The peaks of the spectrum are attributed to B-2 B-1 <--X-2 A(1) transition. The angle-vibration frequency of B-2 B-1 electronic state was calculated. The fluorescence lifetime of B-2 B-1 (0, 9, 0) vibration state under the pressure of 15 Pa was also deduced by measuring the fluorescence time decay spectrum of this state. It is about 49 mu s. Fitting the curve of the fluorescence radiant lifetime versus pressure, the spontaneous radiant lifetimes tau(o) and the rate coefficient k(q) of non-radiant transition relaxation of B-2 B-1 (0, 9, 0) state are deduced. The results are: tau(o) approximate to 55 mu s and k, = 1.2 X 10(-9) cm(3) molecule(-1) s(-1).

关 键 词：NO2分子 激光诱导荧光激发谱 电子振动态 自发辐射寿命 

分 类 号：O433.4[机械工程—光学工程]