One-dimensional nutation nuclear quadrupole resonance spectroscopy for measurement of the electric field gradient tensor-asymmetry parameter

Abstract

Deuterium quadrupole coupling tensors in methyl halides: Ab initio effective core potential and liquid crystal nuclear magnetic resonance study

Mapping Molecular Orientation in Solids by Rotating-Frame NQR Techniques

“…The orientation distribution for each single crystal was first obtained in separated nutation experiments using the rapid rotating-frame method (16). A sequence composed of 64 pulses of 8 s and a detection interval of 35 s was applied using the solenoidal coil.…”

A general numerical analysis of time-domain NQR experiments

“…One of the first reports to analyze NQR experiments in the time domain was that of Pratt et al [4], who obtained exact solutions for the response of an I = 3/2 spin to on-and off-resonance pulsed excitation. With their explicit expressions at hand, subsequent workers were able to develop ways of determining the electric field gradient (EFG) tensor from 2D nutation experiments and other methods [5][6][7]. More recently, Xia et al [8,9] and Lee [10] have proposed a description of time domain NQR experiments of I = 1 and 3/2 nuclides in terms of a fictitious spin-1/2 formalism.…”

Calculations of Multipulse Sequence in NQR of Spins 32

“…However, to our knowledge, the most used formalism seems to be the interaction representation introduced by Pratt (11,12), since operational calculations using the density-matrix could be performed. As an example, the nutation experiment introduced by Harbison et al (13) to measure the asymmetry parameter was calculated on such grounds (14), as well as NQR imaging multipulse sequences (15). Subjects, such as the study of incommensurate phases, or superconducting materials, show very broad NQR spectra, which are not excited totally by a single echo pulse sequence.…”