physica status solidi (b) · 1968 · 11 citations · 3 references
Natural SciencesPhysicsOpticsPhysical ChemistrySpectroscopyAtomic ExcitationElectronic Excited StatesEmission SpectroscopyOptical Properties Of SolidsOptical SpectroscopyRare-earth-doped MaterialsDefect-related LuminescenceEmission SpectrumExcited Electronic StatesExcited StatesExcited-state Electronic StructureLuminescence MechanismsOptical Emission SpectraVibrational Modes
Abstract A theoretical study is made of light emission from impurity centres of crystals in the non‐equilibrium vibrational state, which appears as a result of the excitation of one of the vibrational sublevels belonging to the excited electronic term. It is shown that owing to these processes anti‐Stokes luminescence may be observed at T = 0°K. The validity of the kinetic equation approach is proved.
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The quantum theory of radiation
International Journal of Quantum Chemistry · 1997 · 2.9K citations
Localized Mode in an Anharmonic Crystal
William M. Visscher · Physical Review · 1964 · 22 citations