Studies on the spin Hamiltonian parameters for Mn in the ZnS nanocrystals and bulks.

The spin Hamiltonian parameters (zero-field splittingD,gfactors and hyperfine structure constants) are theoretically studied for Mn2+in the ZnS nanocrystals and bulks from the perturbation formulae of these quantities for trigonal and cubic tetrahedral 3d5clusters, respectively. The trigonal Mn2+centre in the ZnS nanocrystals is attributed to the impurity–ligand bond angle related to the C3axis about 0.39° larger than that (≈109.47°) of an ideal tetrahedron. Almost the samegfactors and hyperfine structure constants for the nanocrystals and bulks can be ascribed to similar crystal-field environments (i.e. comparable cubic field parametersDq), nearly the same covalency (i.e. the equal covalency factorsN) and the Mn2+3d–3s orbital admixture (i.e. the identical core polarisation constants κ) in both systems. The ligand orbital and spin–orbit coupling contributions are found to be important and should be included in the electron paramagnetic resonance analysis in view of significant covalency. [ABSTRACT FROM AUTHOR]