EPR and optical absorption studies of Cu2+ doped L-arginine phosphate monohydrate single crystals--part II

The EPR spectra of Cu2+ ion in L-Arginine phosphate monohydrate (LAP) at X-band frequencies at room temperature reveal the presence of two magnetically inequivalent interstitial Cu2+ sites in the lattice. The principal values of the g- and A-tensors indicate rhombic symmetry around the Cu2+ ion. From the direction cosines of the principal values of the g- and A- tensors, the orientations of the sites in the lattice have been identified. The bonding parameters were evaluated and the ground state wave function of Cu2+ ion was constructed. The ground state is found to be an admixture of [x2 - y2> and [3z2 - r2> orbitals. The optical absorption studies show four bands centered at 9803, 10753, 15748 and 16666 cm(-1) confirming the rhombic symmetry around the Cu2+ ion. Using the observed bands the crystal field parameters have been evaluated.