氮分子B^3Π_g激发态的光谱研究  

Study on the Emission Spectrum of B^3Π_g State of N_2 Molecule

作　　者：赵晓辉[1] 张连水[1] 张贵银[1] 孙博[1] 李晓苇[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334-336,共3页Spectroscopy and Spectral Analysis

基　　金：河北省自然科学基金 (1 0 2 0 90 );河北大学预研项目 (2 0 0 3Q0 2 )资助

摘　　要：在较低气压 (4Torr)条件下采用直流辉光放电激发氮分子气体 ,得到了氮分子放电等离子体在32 0～ 4 70nm范围内的发射谱 ,其形状为一等间隔的谱线序列 ,并沿长波方向谱线强度逐渐变小。通过计算分析对谱线进行了标定 ,确定该组谱线是由处于C3 Πu 激发态低振动能级的氮分子向B3 Πg 态不同振动能级的辐射跃迁所产生 ;在此基础上计算出氮分子B3 Πg 态的振动频率为 1738 5 0cm-1。结合相关的能级参数计算了C3 Πu (v′ =0 )→B3 Πg (v″ =0～ 5 )之间的Frank Condon跃迁因子 ,实验所得的谱线强度与之符合得很好。DC glow discharge was used to study N_2 molecule at low pressure(4 Torr). The emission spectrum was examined in the range of 320-470 nm in the discharge plasma of N_2, which showed that the emission was composed of a series of spectral lines equidistant, and the relative emission intensity became weaker with longer wavelength, whose distribution accorded with Frank-Condon rule. It is attributed to the transition of C 3Π_u→B 3Π_g. On this base, the authors have calculated the vibrational frequency of B 3Π_g state to be 1 738.50 cm -1. The Frank-Condon factor about C 3Π_u(v′=0)→B 3Π_g(v″=0-5) was calculated, which is consistent with the results of experiment.

关 键 词：氮分子 激发态 谱线强度 光谱研究 辐射跃迁 振动能级 发射谱 间隔 低气压 长波 

分 类 号：O561[理学—原子与分子物理] O562[理学—物理]