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.
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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.
His doctoral work at Florida State University with Michael Kasha included work on the theory of radiationless transitions.

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