Abstract
THE emission spectra which we observe in the visible and ultra-violet region are divided into line and band spectra, of which the first type corresponds to electronic changes of state of single atoms either in neutral or in an ionised state. The band spectra originate from molecules, and the energy quanta emitted in a certain spectral line draw their energy from three sources: (1) change of electronic orbits, (2) change of vibrational energy, and (3) change of rotational energy.
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VEGARD, L. New Types of Emission Spectra. Nature 125, 14 (1930). https://doi.org/10.1038/125014a0
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DOI: https://doi.org/10.1038/125014a0
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