Influence of host lattice in interstital dopant sites: EPR studies on Cu (II) doped sarcosine cadmium bromide single crystals

EPR study of Cu(II) doped in sarcosine cadmium bromide single crystals are carried out at room temperature. The impurity ions occupy the interstitial position in this crystal lattice. Crystalline field around the Cu(II) ion i n this low symmetry crystal is rhombic. The transitions arise from a single paramagnetic site with g(xx) = 2.1082, g(yy) = 2.0005, g(xx) = 2.2071, and A = -64 x 10(-4) cm(-1), A(yy) = -23 x 10(-4) cm(-1), A(u) = -185 x 10(-4) cm(-1). The ground slate is an admixture of d(x-y) and d(z)(2) states. The observed molecular orbital coefficient value alpha(2) = 0.85 reveals a mod erate covalency of the sigma bonding and beta(2) = 0.967 indicates the weak pi bonding. A strong interaction between Cu(II) and nitrogen ligands is fo und to exist.