Zeeman effect on the nuclear quadrupole resonance of ⁸¹Br in single crystals of methyl 4-bromobenzoate, 4,4′-dibromodiphenyl-ether and 4,4′-dibromodiphenylsulphide at 77 K

Abstract

The Zeeman effect on the N.Q.R. of methyl 4-bromobenzoate, 4,4′-dibromodiphenylether, 4,4′-dibromodiphenylsulphide has been studied at 77 K on single crystals, using the ‘geometric method’. The apparatus used in the measurements, which allows one to maintain any temperature between room temperature and 77 K, is described, and the possible significance of the slight variations in the molecular arrangement found in the present measurements and in those performed at room temperature is discussed.