RE-EXAMINATION OF THE THEORY OF ROTATIONAL LINE INTENSITIES IN DIATOMIC SPECTRA
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Publisher:Ohio State University
The theory of rotational line intensities is well documented in the literature. However, it is one thing to have the basic premises and operational techniques of the theory fully specified and quite another to understand fully the subtle results they imply. In order to write a general computer program for generating numerical rotational line intensity factors for most diatomic electronic transitions, it was necessary to find uniform and consistent ways to state such results unambiguously. Therefore, the basic theory was re-examined, from first principles, and the operations specified were carried through to their logical conclusions. As a result, reasons for many of the obscurities that occur in the literature were found and suggestions for their resolution are made. For example, the electronic transition moments can always be chosen to be real, the use of consistent phase factors can be assured by following a few simple rules, and a generalized sum rule for the intensity factors can be derived, which is valid for both spinallowed and spin-forbidden electronic transitions.
Author Institution: Ames Research Center; CRESS, York University, Downsview, Ontario, Canada.
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