Two-Frequency Imaging method for Multi Level Quadrupole Systems

R. H. ACOSTA; H. ROBERT; D. J. PUSIOL

APPLIED MAGNETIC RESONANCE

Año: 1998 vol. 15 p. 11 - 21

0937-9347

An encoding procedure for two-dimensional rotating-frame imaging and positional spectroscopyin quadrupole systems with spin I > 3/2 is reported. The technique consists of a two-frequencyirradiation pulse sequence: The population of a pair of spin states is changed by a radiofrequencypulse with a linear gradient and a second transition, which involves one of the two affectedstates, is excited with a second pulse with a gradient perpendicular to the first one. The spatial-spindistribution in the plane defined by the orthogonal radiofrequency gradients is recorded on Cartesiancoordinates. The theoretical description of the technique and experimental results demonstratingits applicability to a powder sample containing I = 7/2 nucleus are given.