NO_2分子在550～740nm范围内的激光诱导荧光光谱  

Laser Induced Dispersed Fluorescence Spectra of NO_2 in the Range of 550-740 nm

作　　者：张连水[1] 孙博[1] 张贵银[1] 赵晓辉[1] 

机构地区：[1]河北大学物理科学与技术学院,河北保定071002

出　　处：《光谱学与光谱分析》2005年第3期416-419,共4页Spectroscopy and Spectral Analysis

基　　金：河北省自然科学基金 (1 0 2 0 90 )资助项目

摘　　要：以皮秒Nd :YAG激光器的二倍频输出 (5 32nm)作为激发源 ,在室温下 ,对NO2 分子在低气压和较高气压情况下进行了激光诱导荧光研究。在低气压条件下获得了在 5 5 0～ 74 0nm范围内的振动序列 ,将其归属为由第一电子激发态A2 B2 态向基电子态X2 A1态不同振动态的跃迁 ,由此得到对称振动模式和弯曲振动模式的谐振频率 ,分别为ω1=130. 0 72cm-1和ω2 =744 . 14cm-1。并在此基础上对较高气压下荧光光谱产生的明显红移现象进行了解释 ,得到了有意义的结果。Laser induced dispersed fluorescence spectra (LIDFS) of NO2 molecules, excited by second harmonic lines (the output wavelength is 532 nm) of a pulsed Nd: YAG laser at room temperature and at low and high NO2 pressures, were obtained and analyzed. The authors got vibronic progressions in the range of 550-740 nm at low pressure and ascribed them to the transitions from the first excitation electronic state A(2) B-2 to the vibrational levels of the ground electronic state X 2 A,, and then calculated the harmonic frequencies of symmetry stretch and bond stretch: omega(1) = 1.300.72 cm(-1) and omega(2) = 744.14 cm(-1) respectively. On the basis of what was above-mentioned, the authors compared the spectra at low pressure with those at high pressure and pointed out the difference between them. Then the authors also interpreted the obvious red shift of fluorescence spectra at high NO2 pressures in terms of a stepladder model of vibrational deactivation and obtained significative results.

关 键 词：NO2分子 激光诱导荧光光谱 电子激发态 电子态 振动态 跃迁 对称 高气压 低气压 序列 

分 类 号：O561.1[理学—原子与分子物理] O433.4[理学—物理]