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EPR spectra of irradiated Na 2 Cr 2 O 7 · 2 H 2 O crystals
Author(s) -
Alybakov A. A.,
Gubanova V. A.,
Tojchiev N.
Publication year - 1980
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19800151117
Subject(s) - electron paramagnetic resonance , hyperfine structure , spectral line , crystallography , ion , aqueous solution , irradiation , chemistry , atomic physics , physics , nuclear magnetic resonance , organic chemistry , astronomy , nuclear physics
The EPR spectra of X‐irradiated Na 2 Cr 2 O 7 · 2 H 2 O crystals grown from the aqueous solution at room temperature are studied. Three groups of lines are detected, which marked conventionally as C 1 , C 2 and C 3 . Each of the C 1 and C 2 line groups is a superposition of two doublets. The lines are interpreted as due to the Cr 5+ ions in the distorted (stretched) oxygenous tetrahedron. The doublet structure is due to hyperfine interaction with nuclei of 1/2 spin which are protons of water. It is shown that the C 1 and C 2 line groups are due to the centers of the same type with different orientations in the lattice. The principal g ‐tensor values for these centres were as follows: g z = 1.916, g y = 1.978, g x = 1.986.