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The low temperature spectra of absorption and luminescence
of a wide variety of impurity doped organic and inorganic solids
comprise very narrow (io 1O cm1) and intense zero-phonon
lines (zPL). They arise from the purely electronic transistions
in the impurities i.e. from the changes of the electronic state
not accompanied by creation or annihilation of the phonons of the
host solid. (ZPL may be called the optical analog of the M5sbauer
line), Because of their narrowness ZPL's are very sensitive to
even very slight differences in the crystal fields at the 1oca
tions of impurities and the ZPL spectruim of a body of impu.rities
displays a large inhomogeneous broadening (formula available on paper).
Karl K. Rebane
"Impurity-doped low-temperature solids as novel materials for optical data storage and processing", Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); https://doi.org/10.1117/12.22282
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Karl K. Rebane, "Impurity-doped low-temperature solids as novel materials for optical data storage and processing," Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); https://doi.org/10.1117/12.22282