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A compilation of approximately 923,000 allowed, intercombination and forbidden atomic transitions with wavelengths from 0.5 Å to 1000 µm. Wavelengths are calculated from energy-level differences rather than observed values. Its primary intention is to allow identification of observed atomic absorption or emission features, using a selection tool that applies wavelength and other criteria. Most energy level data come from the NIST Atomic Spectra Database.
