The New Encyclopædia BritannicaEncyclopædia Britannica, 1992 |
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Page 20
... photons Limita- tions of quantum. by gaining energy from two photons of frequency less than vo is extremely improbable because the energy due to one absorption is almost always lost by collision before a second photon is absorbed . The ...
... photons Limita- tions of quantum. by gaining energy from two photons of frequency less than vo is extremely improbable because the energy due to one absorption is almost always lost by collision before a second photon is absorbed . The ...
Page 21
Uncer- tainty in energy of photons Limita- tions of quantum mechanics Lumines- cence a quantum process. matter whether the photons all arrive over a time span of a microsecond or of several weeks . The photograph of an interference ...
Uncer- tainty in energy of photons Limita- tions of quantum mechanics Lumines- cence a quantum process. matter whether the photons all arrive over a time span of a microsecond or of several weeks . The photograph of an interference ...
Page 27
... photons of energy higher than that of infrared photons but not sufficient for excitation can lead to photoquenching : the traps are emptied far more rapidly , and thermal deactivation of the centres is enhanced . When iron , cobalt , or ...
... photons of energy higher than that of infrared photons but not sufficient for excitation can lead to photoquenching : the traps are emptied far more rapidly , and thermal deactivation of the centres is enhanced . When iron , cobalt , or ...
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