A new two-pulse free induction decay method to measure solid-state NMR spectra of quadrupolar nuclei with half-integer spin

Abstract

A new two-pulse free induction decay method which allows a more straightforward measurement of quadrupolar solid-state nuclear magnetic resonance spectra in those cases where the so-called nutation spectroscopy is commonly used to study half-integer spins in presented. It is shown both theoretically and experimentally that the Fourier transform of the amplitude of the free induction decay of the central transition after the second of two sufficiently short (nonselective) RF pulses as a function of their time distance yields simplified first-order quadropolar solid-state nuclear magnetic resonance spectra (“reduced spin32” spectra) from which the quadropole frequency and asymmetry parameter can be easily determined.