radiative transition

A transition between two states of a @M03986@, the energy difference being emitted or absorbed as @P04627@. In principle, radiative and radiationless transitions can be distinguished in molecules. The first occur by absorption or emission of light quanta, and the latter is the result of the @T06446@ of electronic @E02250@ into vibrational/rotational energy.
See also:
radiationless transition
Orange Book, 2nd ed., p. 185 [Terms] [Book]
PAC, 1984, 56, 231. (Nomenclature, symbols, units and their usage in spectrochemical analysis-Part VI: molecular luminescence spectroscopy) on page 234 [Terms] [Paper]
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2270 [Terms] [Paper]