title: Electron paramagnetic resonance and optical absorption spectral studies on chalcocite.
abstract: A chalcocite mineral sample of Shaha, Congo is used in the present study. An electron paramagnetic resonance (EPR) study on powdered sample confirms the presence of Mn(II), Fe(III) and Cu(II). Optical absorption spectrum indicates that Fe(III) impurity is present in octahedral structure whereas Cu(II) is present in rhombically distorted octahedral environment. Mid-infrared results are due to water and sulphate fundamentals.
authors.affiliation: Department of Physics, SVD College, Kadapa, India. slreddy_in@yahoo.com
authors.forename: S Lakshmi
authors.initials: SL
authors.lastname: Reddy
authors.forename: Md
authors.initials: M
authors.lastname: Fayazuddin
authors.forename: Ray L
authors.initials: RL
authors.lastname: Frost
authors.forename: Tamio
authors.initials: T
authors.lastname: Endo
mesh_terms: D003300:Copper; D004578:Electron Spin Resonance Spectroscopy; D008903:Minerals / Q000737:chemistry*; D055095:Optics and Photonics; D013056:Spectrophotometry, Ultraviolet; D019265:Spectroscopy, Near-Infrared; D013696:Temperature; D013816:Thermodynamics
chemical_list: D008903:Minerals; D003300:Copper