[1][2] The pretreatment ("excitation") turns the objects into an unequilibrial state.
The relaxation can be stimulated e.g. by slight heating or longwave illumination, not causing emission from untreated samples.
Accordingly, thermo- and photostimulated EE (TSEE, PSEE) are distinguished.
Thus, EE is an electron emission analogue of such optical phenomena as phosphorescence, thermo- and photostimulated luminescence.
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