双原子分子电子光谱的振动结构分析

从电子振转能级的光谱项出发，分析了双原子分子电子振动谱带序和电子振动谱带列的规律，并归纳出德兰德斯表(Deslandres table)及其主要性质。以C₂分子电子振动光谱的斯簧谱带系作为实例，说明了如何对电子振动光谱的测量值进行标识，并将它们按振动结构规律整理成德兰德斯表，从而获得有关分子光谱不同态的非谐性常数、振动频率等重要参数以及任意谱带的波数公式。

The Analysis of Vibrational Structure of the Electronic Spectra of Diatomic Molecules

On the basis of the spectrum term of a electronic rotational-vibrational energy level, the law of vibrational band sequences and progressions in diatomic molecules was analysed. According to the law, the Deslandres table and its nature were summarized. How to indicate the measured values of a electronic-vibrational spectrum was illustrated by taking the Swan band spectra of the Cz molecule as an example. In the example, the measured values were put in order which formed the Deslandres table in terms of the law of vibrational structure. The authors can gain some important data, such as anharmonicity constants and harmonic oscillator frequencies in different vibrational states, concerning the band spectra of molecules. Furthermore, the formula of wave numbers of every band spectrum was derived.