A two-index arrangement of vibronic transition wavenumbers. Differences along rows isolate lower-state spacings; differences down columns isolate upper-state spacings. Deviations from exact separability can expose measurement uncertainty, rotational structure or incorrect assignments.
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The Deslandres table, also known as the Deslandres chart, is a tool used in the field of astronomy and astrophysics to facilitate the classification and analysis of celestial bodies' spectra, particularly stars. Named after the French astronomer Camille Deslandres, the table organizes spectral lines based on their wavelengths. In detail, the Deslandres table presents a systematic arrangement of the absorption or emission lines observed in the spectra of stars.