title: Spectroscopic and structural characterization of pascoite.
abstract: Pascoite mineral having yellow-orange colour of Colorado, USA origin has been characterized by EPR, optical and NIR spectroscopy. The colour dark red-orange to yellow-orange colour of the pascoite indicates that the mineral contain mixed valency of vanadium. The optical spectrum exhibits a number of electronic bands due to presence of VO(II) ions in the mineral. From EPR studies, the parameters of g, A are evaluated and the data confirm that the ion is in distorted octahedron. Optical absorption studies reveal that two sets of VO(II) is in distorted octahedron. The bands in NIR spectra are due to the overtones and combinations of water molecules.
authors.affiliation: Department of Physics, S.V.D. College, Kadapa 516003, India.
authors.forename: G Udayabhaskara
authors.initials: GU
authors.lastname: Reddy
authors.forename: R Ramasubba
authors.initials: RR
authors.lastname: Reddy
authors.forename: S Lakshmi
authors.initials: SL
authors.lastname: Reddy
authors.forename: Ray L
authors.initials: RL
authors.lastname: Frost
authors.forename: Tamio
authors.initials: T
authors.lastname: Endo
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D013055:Spectrophotometry, Infrared; D019265:Spectroscopy, Near-Infrared; D017968:Vanadium Compounds / Q000737:chemistry*
chemical_list: D017968:Vanadium Compounds