Cheng, Lu A ULFC method for d(4)(D(2d)) ions and a study of the spin singlets contributions to zero-field splitting of Cr(2+) ions in zinc sulfide crystals. [electronic resource] - The journal of physical chemistry. A Nov 2007 - 11110-5 p. digital Publication Type: Journal Article ISSN: 1089-5639 Standard No.: 10.1021/jp075519x doi