EPR spectra of VO2+ and Cu2+ ions in di-ammonium D-tartrate single crystals

Abstract

EPR spectra of Cu2+ and VO2+ ions in di-ammonium D-tartrate [(NH4)(2)C4H4O6] Single crystals have been studied at room temperature and at 113 K in three mutually perpendicular planes. Both ions yield unexpectedly large number of lines. The spin Hamiltonian parameters are determined. A numerical technique together with a trial and error procedure is used to resolve the spectra, The principal g and the hyperfine (A) values of both of the ions were determined. (C) 2000 Elsevier Science Ltd. All rights reserved.