Premium
EPR of a New O 2 − Centre in KCl
Author(s) -
Callens R.,
Callens F.,
Matthys P.,
Boesman E.
Publication year - 1988
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.2221480227
Subject(s) - electron paramagnetic resonance , orthorhombic crystal system , impurity , principal axis theorem , ion , doping , materials science , spectral line , crystallography , tilt (camera) , chemistry , nuclear magnetic resonance , crystal structure , physics , geometry , mathematics , optoelectronics , organic chemistry , astronomy
EPR results are given of a new O 2 − paramagnetic defect, formed following room temperature X‐ray irradiation in KCl, heavily doped in the melt with KNO 2 . The EPR spectra indicate that the O 2 − molecular ion has two equivalent equilibrium positions between which it jumps. Above 10 K the EPR spectrum of this molecular ion is orthorhombic, with principal axes [110], [001], and [1 1 0]. Below this transition temperature the principal axes are tilted by 1° with respect to the [110] and [1 1 0] directions in the (110) plane. A possible model for the perturbing impurity responsible for this tilt is proposed.