The New Encyclopædia BritannicaEncyclopædia Britannica, 1992 |
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Page 26
... centre , with the energy moving through the crystal in the form of exci- tons ( ion - electron pairs ) until it approaches a centre where the excitation process can occur . This energy transfer can also be realized by radiation in ...
... centre , with the energy moving through the crystal in the form of exci- tons ( ion - electron pairs ) until it approaches a centre where the excitation process can occur . This energy transfer can also be realized by radiation in ...
Page 28
... centre by emitting a photon . An activator centre that captures such an excited electron has already lost one of its own electrons to a positive hole ( electron vacancy ) in the host - crystal lattice . The energetic level of the traps ...
... centre by emitting a photon . An activator centre that captures such an excited electron has already lost one of its own electrons to a positive hole ( electron vacancy ) in the host - crystal lattice . The energetic level of the traps ...
Page 614
... centre , consists of an electron trapped at a halogen vacancy . If the F centre traps a second electron , it becomes an F ' centre . Two adjacent F centres form an M centre , while three F centres form an R centre . The F and M centres ...
... centre , consists of an electron trapped at a halogen vacancy . If the F centre traps a second electron , it becomes an F ' centre . Two adjacent F centres form an M centre , while three F centres form an R centre . The F and M centres ...
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