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Theory for the Magnetic Circular Polarization of the F‐Center Luminescence
Author(s) -
Iwahana K.
Publication year - 1985
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221280134
Subject(s) - excited state , luminescence , radiative transfer , polarization (electrochemistry) , magnetic field , circular polarization , atomic physics , condensed matter physics , physics , rate equation , chemistry , optics , quantum mechanics , kinetics
A simple theoretical model is developed for the magnetic circular polarization (MCP) of the F‐center luminescence on the basis of a vibronic theory. In this model new rate equations for the optical pumping cycle are proposed to describe the unthermalized spin systems at low temperatures. It is shown that the model can consistently explain the unusual dependences of the MCP upon the magnetic field and temperature which are observed in the low temperature region. From the analysis of the temperature dependence of the MCP, Δ MCP ( T ), in the high temperature region, it is found that one must have Δ > 2 as far as V 4 ≦ 0.6 to account for the nearly temperature independent behaviour of Δ MCP ( T ) in KCl in contrast to Δ < 2 given previously from the analysis of the temperature dependence of the radiative lifetime. It is pointed out that the discrepancy may be reconciled if assuming that the contribution to Δ MCP ( T ) of the field‐induced level splitting in the adjacent excited states is negligibly small.