Pipkin, Francis M. Formerly, Department of Physics, Harvard University, Cambridge, Massachusetts.
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A measure of the width of the band of frequencies of radiation emitted or absorbed in an atomic or molecular transition. One of the dominant sources of electromagnetic radiation of all frequencies is transitions between two energy levels of an atomic or molecular system. The frequency of the radiation is related to the difference in the energy of the two levels by the Bohr relation, Eq. (1),
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