标题: 求助双原子分子光谱项 比如CO分子的A1pi态前面的A代表什么意思 [打印本页] 作者Author: wdufo 时间: 2023-10-31 10:43 标题: 求助双原子分子光谱项 比如CO分子的A1pi态前面的A代表什么意思 各位老师好，学生对双原子分子光谱项前的大小写字母标记规则有疑问。
1.在Modern Spectroscopy这本书里提到 “ There is a convention, which is commonly but not always used, for labelling electronic states. The ground state is labelled X and higher states of the same multiplicity are labelled A, B, C... in order of increasing energy. States with multiplicity different from that of the ground state are labelled a, b, c... in order of increasing energy.”按照书中写的双原子分子光谱项前的大小写字母是按能量顺序排列的，但是对于PN分子貌似不是这种情况。PN分子的C1Σ-态的能量反而比A1Π态的能量更低，请问这是根据什么排列的？