Determination of the quadrupole coupling from featureless line shapes

Abstract

NMR nutation and quadruple echo experiments were used to determine the quadrupole frequency (oQ) of *'Rb ( I = 312) in a single crystal of RbCaF, . Since RbCaF, has a cubic unit cell above 195 K, there is no second-order quadruple shift and the spectrum is rather featureless. By fitting the response of *'Rb, as a function of pulse duration, to the predided response we were able to determine that the average wQ/2z = 4.5 kHZ in this sample.Discrepancies in the agreement between the theory and the experiment for the echo response were attributed to differential relaxation of the central and satellite transitions.

Semi‐analytical description of the S = 9/2 quadrupole nutation NMR experiment: multinuclear application to 113In and 115In in indium phosphide

“…Nutation NMR spectroscopy takes advantage of differences in the evolution of quadrupolar nuclei under the influence of soft pulses . The method that has been used the most is to predict the amplitude of the free‐induction decay following a one‐pulse excitation as a function of the pulse duration and compare the results with experimental data . These predictions have been made by numerical or analytical methods for spins S = 3/2, S = 5/2 and S = 7/2.…”

“…[3,4] The method that has been used the most is to predict the amplitude of the free-induction decay following a one-pulse excitation as a function of the pulse duration and compare the results with experimental data. [5][6][7][8][9][10][11][12][13][14][15][16] These predictions have been made by numerical or analytical methods for spins S = 3/2, S = 5/2 and S = 7/2. Because there are several spins S = 9/2 in the Periodic Table ( 73 Ge, 83 Kr, 87 Sr, 93 Nb, 113 In, 115 In, 179 Hf and 209 Bi), it is of interest to extend the calculations to such a spin number.…”