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

Abstract

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.