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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 8:16 |
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Conference: Bucharest University Faculty of Physics 2008 Meeting
Section: Atomic and Molecular Physics; Astrophysics
Title:
New features of the charge compensation mechanisms of Mn2+ in NaCl performed by multifrequency HF-EPR spectroscopy
Authors:
N. Barascu(1), L. A. Pardi(2), C. A. Massa(2), S. Nistor(3), M. Stefan(3), A. Darabont(4), C. Neamtu(4), V. Bercu(1) and F. F. Popescu(1)
Affiliation:
1)University of Bucharest, Faculty of Physics, 405 Atomistilor,Street, Magurele, Magurele, Romania
2) Istituto per processi chimico-fisici CNR, Via Moruzzi 1, Pisa, Italia
3) National Institute for Materials Physics, 077125 Magurele-Bucharest, Romania
4) National Institute for Isotopic and Molecular Technologies, 400293 Cluj-Napoca, Romania
E-mail
vbercu@gmail.com
Keywords:
HF-EPR, charge compensation, local symmetry
Abstract:
Many theoretical and experimental attempts have been made in alkali halides to understand the mechanism of charge compensation of the divalent impurities. In the high field limit the EPR spectra exhibit an important simplification. Three different charge compensation mechanisms was observed for the Mn2+ ions. The multifrequency analysis of the EPR spectra corresponding to the three mechanisms allowed us to identify the local symmetry change due to the charge compensation. By heating and quenching, we have found the intensification of the number of paramagnetic Mn2+ centers due to the compensation in the first neighboring and the corresponding diminution of the other charge compensation mechanisms.
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