Zeeman NQR Studies on Polycrystals of Copper Compounds, Arsenic Compounds, and Chlorine Compounds

Abstract

AbstractPowder Zeeman NQR (PZNQR) spectra of 63Cu,75As, and 35Cl in various compounds have been observed at 77 K. On the basis of the types of simulated integral curves of PZNQR absorption, the estimated asymmetry parameters of the electric field gradients have been divided into three classes; (1) measurable, (2) small (smaller than about 0.05), and (3) very small (probably zero). The asymmetry parameters have been found to be very small ( Cu, NQR frequency = 26.704 MHz) in Cu,0;0.40 (63Cu, 32.617 MHz) in KCu(CN)2; very small (75As, 116.820 MHz) in As2O3 ; very small (75As, 78.950 ; 35Cl, 25.0567 and 25.4036 MHz) and small ( 35Cl, 24.9581 MHz) in ASCl3 ; very small (75As, 98.501 and 99.046 MHz) in As(C6H5)3; small (38.389 MHz), 0.15 (38.464 MHz), and 0.14 ( 38.503 MHz) for 35Cl in hexachlorobenzene; small ( 35.847 MHz) and very small ( 39.154,39.603 , and 39.615 MHz) for 35Cl in l-chloro-2-(trichloromethyl)-benzene; small ( 32.619 MHz) and very small ( 32.878 MHz) for 35Cl in 1,4-dichlorobutane; very small ( 37.828 and 38.051 MHz) for 35Cl in 1,1,1 -trichloroethane.