摘要
利用皮秒Nd :YAG激光器泵浦的光学参量发生 /放大器作激发源 ,获得了NO分子在 4 6 0～ 5 70nm波长范围内的多光子离化谱 ,测量了离化信号随激光强度的关系 ,其近五次方关系表明在 4 6 0～ 5 70nm波长范围内NO分子吸收 5个光子而离化。通过对谱线的归属 ,确认在此波长范围内 ,NO分子的离化过程是通过高激发态D2 Σ的共振增强的多光子离化过程。用最小二乘法拟合 ,获得了D2
NO is an important pollutant molecule, and plays a key role in generating photochemical smog and destroying O_3 in the (atmosphere.) So researchers have always been interested in it. In our experiment, the optical parameter generator and amplifier ((EKSPLA)) pumped by Nd:YAG (Quantel) laser were used as the radiation source. The REMPI spectrum of NO in the region of 460-570 nm was obtained. Based on theoretical calculation, most of the lines were attributed to the X^2Π→D^2Σ transition. The ionization pathway was discussed in detail, which can be shown as NO(X^2Π)3hνNO(D^2Σ)2hνNO^++e. The vibration fundamental and force constant of NO(D^2Σ) state were calculated. The results are ω_e=2 339.2 cm^(-1) and k=2.41×10~5 dyn·cm^(-1). For future work, the resolution of the radiation source will be improved in order to obtain more information of the D^2Σ state.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2004年第10期1185-1187,共3页
Spectroscopy and Spectral Analysis
基金
河北省自然科学基金 (1 0 2 0 90 )
华北电力大学青年科研基金资助项目
关键词
一氧化氮
共振增强
多光子离化谱
D^2∑态
基振动频率
力常数
NO molecule
Resonance-Enhanced Multiphoton Ionization(REMPI) spectrum
D^2Σ state
Molecule constants
