EPR and optical absorption studies of VO2+ doped L-alanine (C3H7NO2) single crystals

Biyik R.

PHYSICA B-CONDENSED MATTER, cilt.404, sa.20, ss.3483-3486, 2009 (SCI-Expanded, Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 404 Sayı: 20
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1016/j.physb.2009.05.039
  • Dergi Adı: PHYSICA B-CONDENSED MATTER
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.3483-3486
  • Anahtar Kelimeler: L-Alanine, EPR, Absorption spectrum, Vanadyl ion, ELECTRON-PARAMAGNETIC-RES, BETA-CELL LINE, VANADYL ION, RESONANCE, COMPLEXES, SPECTRA, CU2+
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

VO2+ doped L-alanine (C3H7NO2) single crystals and powders are examined by electron paramagnetic resonance (EPR) and optical absorption spectroscopy. Three magnetically different sites are resolved from angular variations Of L-alanine single crystal EPR spectra. In some specific orientations each VO2+ line splits into three superhyperfine lines with intensities of 1:2:1 and maximum splitting value of 2.23 mT. The local symmetries of VO2+ complex sites are nearly axial. The optical absorption spectra show three bands. Spin Hamiltonian parameters are measured and molecular orbital coefficients are calculated by correlating EPR and optical absorption data for the central vanadyl ion. (C) 2009 Elsevier B.V. All rights reserved.