title: Optical absorption and EPR studies on tenorite mineral.
abstract: Optical absorption and EPR studies of the mineral tenorite, a cupric oxide which originated from Mexico and contains 54.40 wt% of CuO. EPR spectral results indicate two Cu(II) closely interacting ions to give a d(2) type structure. The calculated spin Hamiltonian at room temperature and liquid nitrogen temperature is g=2.160 and D=125 G. The intensity of resonance line is not the same in low and high field regions. The optical absorption spectrum is due to Cu(II) in which three sets of energies indicating Cu(II) in two independent tetragonal C(4v) symmetry, in addition to d(2) structure of octahedral coordination. The octahedral and tetragonal field parameters are compared with those reported for several other copper containing minerals.
authors.affiliation: Department of Chemistry, SVD College, Kadapa, India.
authors.forename: R Rama Subba
authors.initials: RR
authors.lastname: Reddy
authors.forename: S Lakshmi
authors.initials: SL
authors.lastname: Reddy
authors.forename: P S
authors.initials: PS
authors.lastname: Rao
authors.forename: R L
authors.initials: RL
authors.lastname: Frost
mesh_terms: D000042:Absorption; D003300:Copper / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D008903:Minerals / Q000737:chemistry*; D055095:Optics and Photonics / Q000379:methods*; D013696:Temperature; D013816:Thermodynamics; D014131:Trace Elements / Q000737:chemistry*
chemical_list: D008903:Minerals; D014131:Trace Elements; D003300:Copper; C030973:cupric oxide