Nuclear electric hexadecapole coupling constant in antimony trichloride

Abstract

The electric hexadecapole coupling constant of 123Sb (nuclear spin I = 1 2 ) in SbCl 3 was determined from the accurate measurement of three nuclear quadrupole resonance frequencies, ν 1 (± 1 2 −± 1 2 ), ν 2 (± 3 2 −± 5 2 ), ν 3 (± 5 2 −± 7 2 ) at the same sample temperature. To avoid error produced from the change of the sample temperature, ν 1, and ν 2, or ν 2 and ν 3 were alternately and repeatedly measured as quickly as possible, and the relations between them were determined. To measure the NQR frequency quickly without the disturbance by a marker signal, two marker signals were displayed on both sides of the NQR signal. A method to evaluate the real NQR frequency from a slightly asymmetric lineshape was introduced. As a result, three NQR frequencies were determined at each sample temperature. The values of the hexadecapole coupling constant eMm, quadrupole coupling constant eQq, and asymmetry parameter η, were found as follows; when ν 2 = 67.732 MHz, eMm = 109.8 ± 60.6 kHz, eQq = 480.5177 MHz, and η = 0.1593909.