Abstract
Two semiautomatic assignment programs have been developed as a part of an extensive computer-program system for the assignment and analysis of vibration-rotation spectra. One prints the Loomis-Wood diagram on which every observed line is marked with a digit indicating the line intensity. The second constructs a new diagram, which is based on the combination-difference method; the calculated wavenumbers are arranged in the order of their quantum numbers and the observed lines in vicinity of each calculated wavenumber are plotted as on the Loomis-Wood diagram. Using these diagrams, the assignment of the rotational structure may be made consistently and almost automatically. Applications to the assignments of spectra of OCS, CH 3I, and C 2H 4 are shown as examples.
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