화학공학소재연구정보센터
Chemical Physics Letters, Vol.594, 13-17, 2014
N-14 Quadrupole Resonance in the presence of a weak static magnetic field. Direct determination of the electric field gradient tensor
The electric field gradient tensor (considered here at the level of a nitrogen nucleus) can be described by two parameters: the largest element in the (x, y, z) principal axis system, denoted by V-zz, and the asymmetry parameter eta = (V-yy - V-xx)/V-zz. The frequencies of the three nitrogen-14 NQR transitions depend on both parameters and two of them are, a priori, necessary for their determination. We demonstrate that, if a weak static magnetic field is applied during a NQR experiment, both parameters can be obtained from a single transition thus alleviating the difficulties for finding out N-14 Quadrupole Resonance lines. (C) 2014 Elsevier B.V. All rights reserved.