Practical Aspects of Molecular Spectroscopy in Plasmas 2.Introduction to Molecular Spectroscopy

Abstract

The structures of rotational and vibrational energy levels and the term symbols to classify different electronic states are described for diatomic molecules. Different classes of parity, (+/−), (e/f) and (s/a), associated with each rovibronic level are discussed. The transition probability, the Franck-Condon factors, the Hönl-London factors and the transition moments of electronic transitions and their selection rules are described.