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- W2032471020 abstract "The low-temperature optical conversion of $F$ centers in NaBr and NaI into defects with absorptions at equal or higher energies was studied under magnetic fields up to 80 kG. A strong reduction of the optical conversion was observed under fields giving clear evidence that the reaction product of the conversion is an ${F}^{ensuremath{'}}$ center with two electrons in a singlet state, the formation of which becomes forbidden in spin-polarized $F$-center systems. This magnetic field quenching of the ${F}^{ensuremath{'}}$ conversion (Porret-Luty effect), however, is incomplete even under full spin polarization indicating the existence of some loss mechanisms. To clarify the latter, we measured the spin-memory loss during the optical cycle by monitoring the magnetic circular dichroism (MCD) under known pumping conditions, obtaining spinmixing parameters of $ensuremath{epsilon}=0.03 mathrm{and} 0.12$ for NaBr and NaI, respectively. These $ensuremath{epsilon}$ values can explain only in part the incompleteness of the magnetic field effect, hinting towards the existence of a bound triplet ${F}^{ensuremath{'}}$ state. From the MCD measurement, the spin-lattice relaxation time of the $F$ ground state as a function of magnetic field and the spin-orbit---splitting parameter $ensuremath{Delta}$ of the $F$ center were determined too." @default.
- W2032471020 created "2016-06-24" @default.
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- W2032471020 date "1983-04-15" @default.
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- W2032471020 title "Spin-polarization and spin-memory effects in the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>F</mml:mi></mml:math>-center absorption and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi>F</mml:mi></mml:mrow><mml:mrow><mml:mo>′</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>conversion of NaI and NaBr crystals" @default.
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- W2032471020 doi "https://doi.org/10.1103/physrevb.27.5039" @default.
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