Relative orientations of the 14N EFG tensors in hydrazine from pure nuclear quadrupole relaxation study

Abstract

The description of the PNQR relaxation in the ν plane is extended to the case of two nuclei of spin I = 1 interchanging by a dynamic process. The theory is applied to hydrazine, in which the two inequivalent nitrogen atoms interchange sites. Spin lattice relaxation measurements on all six ¹⁴N NQR lines were done at 228°K. Three types of experiments were performed: (i) steady state continuous pulse experiments, (ii) two‐pulse experiments on the same transitions, and (iii) cross relaxation experiments in which the first pulse was applied to a transition of one site and the second pulse to the corresponding transition of the other site. Detailed analysis of these experiments gave accurate results for the relative orientations of the EFG tensors of the two ¹⁴N sites. The angles between the corresponding directions are: φ_XX = 93°.7, φ_YY = 16°.7, and φ_ZZ = 91°.0.