Temperature Dependence of Nuclear Quadrupole Resonance Frequencies of 121Sb, 123Sb and 35Cl in Solid Antimony Trichloride

Nuclear quadrupole resonance frequencies of 121 Sb, 123 Sb, and 35 Cl in solid antimony trichloride were measured between 20°K and about 150°K to learn molecular motions and intermolecular forces in the solid. By use of a newly computed eigenvalue table, the quadrupole coupling constant and the asymmetry parameter of 121 Sb and 123 Sb were calculated. The asymmetry parameter decreases from 0.192 at 20°K to 0.180 at 140°K. The results were interpreted in terms of librational motion and weak intermolecular covalent bonds between Sb and Cl atoms.