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Enhancement of 3d‐Electron Transitions in Neutron‐Irradiated MgO:Mn 2+ Crystals
Author(s) -
Okada M.,
Kawakubo T.,
Seiyama T.,
Nakagawa M.
Publication year - 1987
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.2221440250
Subject(s) - ion , irradiation , electron , absorption (acoustics) , neutron , atomic physics , materials science , crystallography , chemistry , physics , nuclear physics , organic chemistry , composite material
A study of optical absorption of 3d‐electrons in neutron‐irradiated MgO:Mn 2+ crystals is made. Intensity enhancements and energy shifts of spin‐forbidden optical transitions of Mn 2+ ions are observed in samples as‐irradiated and after heat treatments. An investigation of thermal properties of optical absorption for Mn 2+ ions and F centres in the irradiated MgO:Mn 2+ indicates the presence of two types of defects associated with F centres. These defects are accounted for as an interstitial‐Mn 2+ –F center complex and a Mn 2+ –F centre complex. The origin of the optical transition enhancement and energy shifts are attributed to both, an exchange interaction of Mn 2+ ions with F‐center electrons and a parity‐forbidden removal caused from symmetry changes due to the formation of above described complexes.