Procedures are described, in this pedagogical monograph, for making quantum
mechanical calculations of rotational energy levels and rotational line
intensities in diatomic molecules. The procedures are illustrated by sample
calculations. A familiarity with the material of this report should enable a
practicing electronic spectroscopist to carry out, though in a rather
mechanical way, his own theoretical calculations for molecules under
experimental investigation. The material of this report is aimed at electronic
spectroscopists who have had the equivalent of one semester of graduate level
quantum mechanics.
Key words: Diatomic molecules; Hund's coupling cases; rotational levels;
rotational line intensities; theoretical calculations.