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[en] A special system was developed for additive coloration of ionic crystals allowing the control of the concentration of the introduced F centers and of the crystal temperature independently. (author)

No abstract available

[en] Full Text: The ESR in two samples of BN doped with C¹3 and without of carbon had been investigated F-center type defects, representing charged vacancy of nitrogen, at which vicinity an unpaired electron of carbon atom is localized, had been found. It has been revealed that irradiation of BN with UV-light does not lead to generation of new paramagnetic centers, but only increases the concentration of F⁺-centers due to promotion of electron centers F⁰, being at nonparamagnetic state. It is shown that with increase of amount of photosorbed O₂ the ESR spectra amplitude increases, and at oxygen pressure in gaseous phase P₀ =0,8 Pa the saturation of spectra is observed

[en] Published in summary form only

No abstract available

No abstract available

[en] The cathodoluminescence of uranium oxide surfaces prepared in-situ from clean uranium exposed to dry oxygen was studied. The broad asymmetric peak observed at 470 nm is attributed to F-center excitation

[en] The possibility of the existence of F_H centers in CsF is investigated, using the Bartram et al. method. Several types of wave functions for the F_H center electron were tested. The optimal value for the semiempirical parameter Α was founded about Α = 0.70. There is not convergence for some wave functions using Α > 0.70, and for Α < 0.70 the ion-size correction is smaller than that obtained for Α 0.70. Even for this case the change of the F_H optical absorption with respect of the F center is small. In this paper the correct expression for the ground state energy functional of the Gourary-Adrian wave functional type II is given. (Author)

No abstract available