title: EPR and optical absorption studies of VO2+ doped L-arginine phosphate monohydrate single crystals--part I.
abstract: The electron paramagnetic resonance (EPR) studies on VO2+ doped L-arginine phosphate monohydrate (LAP) single crystals at room temperature at X-band frequencies reveal the presence of two magnetically inequivalent VO2+ sites occupying interstitial positions in the lattice with fixed orientations and show very high angular dependence. The principal values of the g and A tensors indicate that the electrostatic field around the VO2+ ion is rhombic. The optical absorption spectra at room temperature show four absorption bands at 16155, 14775, 10928 and 10526 cm(-1), characteristic of rhombic symmetry. From EPR and optical absorption data, the molecular orbital bonding coefficients (beta2, epsilon2, P and k) and the crystal field parameters have been evaluated.
authors.affiliation: Department of Physics, Bharathidasan University, Tiruchirapalli, India.
authors.forename: P A
authors.initials: PA
authors.lastname: Angeli Mary
authors.forename: S
authors.initials: S
authors.lastname: Dhanuskodi
mesh_terms: D001120:Arginine / Q000031:analogs & derivatives* / Q000737:chemistry*; D003460:Crystallization; D004578:Electron Spin Resonance Spectroscopy; D009943:Organophosphorus Compounds / Q000737:chemistry*; D013053:Spectrophotometry; D055672:Static Electricity; D013816:Thermodynamics; D014638:Vanadates / Q000737:chemistry*
chemical_list: D009943:Organophosphorus Compounds; C015441:phospho-L-arginine; D014638:Vanadates; D001120:Arginine