EPR Spectra of VO2+-Doped Ammonium Oxalate Monohydrate Single Crystals

Abstract

The EPR spectra of VO2+ions in ammonium oxalate monohydrate, [(NH<inf>4</inf>)<inf>2</inf>C<inf>2</inf>O<inf>4</inf>H<inf>2</inf>O], single crystals have been studied at room temperature and at 113 K in mutually three perpendicular planes. The spin Hamiltonian parameters are determined using a numerical technique together with a trial and error procedure to resolve the single crystal spectra. The parallel and perpendicular components of axially symmetric g and hyperfine tensors for VO2+ion in ammonium oxalate monohydrate single crystal are determined, and the results are discussed. © 1999, Verlag der Zeitschrift für Naturforschung. All rights reserved.