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Your search keyword '"A. S. Myasnikova"' showing total 2 results
Start Over Author "A. S. Myasnikova" Journal radiation measurements
2 results on '"A. S. Myasnikova"'

1. Optical absorption spectra of X-ray irradiated alkaline earth fluoride crystals doped with divalent rare-earth ions studied by thermal bleaching

Author

E. A. Radzhabov, A. S. Myasnikova, A. V. Egranov, T. Sizova, and Roman Shendrik

Subjects
010302 applied physics, Thermal oxidation, chemistry.chemical_classification, Lanthanide, Alkaline earth metal, Radiation, Materials science, Absorption spectroscopy, Inorganic chemistry, 01 natural sciences, 030218 nuclear medicine & medical imaging, Divalent, Ion, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, chemistry, 0103 physical sciences, Absorption (chemistry), Instrumentation, Fluoride
Abstract

The absorption spectra of X-ray irradiated alkaline earth fluoride (CaF2, SrF2, BaF2) crystals doped with Sm, Нo, Er, Tm ions are investigated by thermal bleaching of the sample in the 300–700 K temperature range. X-ray irradiation creates absorption bands of inter-configuration 4fn-4fn−1-5 d1 transitions of divalent impurity ions and F3− and (F2−)ii hole centers. The thermal oxidation of the divalent RE ions have been observed. Two possible mechanism of thermal oxidation of divalent lanthanide ions in alkaline-earth fluorides are discussed.

Published
2019

2. Luminescence of photochromic centers in calcium fluoride crystals doped with Lu3+ ions

Author

E. A. Radzhabov, T.Yu Sizova, Roman Shendrik, and A. S. Myasnikova

Subjects
Condensed Matter - Materials Science, Radiation, Absorption spectroscopy, 010308 nuclear & particles physics, Chemistry, Doping, Ab initio, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, chemistry.chemical_element, 02 engineering and technology, 021001 nanoscience & nanotechnology, Photochemistry, 01 natural sciences, Ion, Condensed Matter::Materials Science, Photochromism, Absorption band, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Fluorine, 0210 nano-technology, Luminescence, Instrumentation
Abstract

We report data on the luminescence spectra associated with photochromic centers in X-ray irradiated calcium fluoride crystals doped with Lu ions. Irradiation in low energy photochromic centers absorption band excites emission, which can be identify with transitions into photochromic centers. Ab initio calculation of absorption spectrum of photochromic center agrees rather well with experimental data.

Published
2016

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