radiationless transition

radiationless transition

[‚rād·ē′ā·shən·ləs tran′zish·ən]
(physics)
A transition of a system between two energy states in which energy is given to or taken up from another system or particle, rather than being emitted or absorbed in electromagnetic radiation; examples include internal conversion, the Auger effect, and excitation or deexcitation of atoms or molecules in collisions with other atoms or molecules.
References in periodicals archive ?
Since the transition probabilities and the spectral line intensities have been determined by the FC factor, it also plays an important role in determination of the optical and radiationless transition rates between vibration levels [1-3].
Furthermore, radiationless transitions have also been considered to cause fluorescence quenching, which is an unwanted process in photocatalysis either, increasing heat loss [39].
His thesis concerned "Radiationless Transitions in Mu-mesonic Atoms." He next entered Yale University, where he earned an M.S.
He introduces the basic concepts of light and matter to begin, then explains light adsorption and electronically-excited states, the physical deactivation of excited states, radiative processes of excited states, intramolecular radiationless transitions of excited states, intermolecular physical processes of excited states, some aspects of the chemical properties of excited states, the photochemistry of alkenes and carbonyl compounds, some aspects of photochemical reaction mechanisms, semiconductor photochemistry, and an introduction to supramolecular photochemistry.
Alternatively, in the photothermal process, the electronic energy is converted via radiationless transitions into heat.

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