radiationless transition

A transition between two states of a system without photon emission or absorption.
See also:
radiative transition
Orange Book, 2nd ed., p. 185 [Terms] [Book]
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2269 [Terms] [Paper]
See also:
PAC, 1984, 56, 231. (Nomenclature, symbols, units and their usage in spectrochemical analysis-Part VI: molecular luminescence spectroscopy) on page 234 [Terms] [Paper]