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Incident photon Tkoq

Egnd-

Figure 8.2. Energy-level diagram showing an incident photon ftajo raising an electron from its ground state E^ to an excited state E^, and a subsequent radiationless transition to a long-lived metastable state E^ followed by luminescent emission of a photon /law the emitted light, or by combining both techniques. Luminescent spectra will be examined for all these variations. Light emission can also be induced by gradually heating a sample, and the resulting thermal luminescence manifests itself by the emission of light over a characteristic temperature range. This emission is called a glow peak.

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