Recording 2-D Nutation NQR Spectra by Random Sampling Method

Abstract

The method of random sampling was introduced for the first time in the nutation nuclear quadrupole resonance (NQR) spectroscopy where the nutation spectra show characteristic singularities in the form of shoulders. The analytic formulae for complex two-dimensional (2-D) nutation NQR spectra (I = 3/2) were obtained and the condition for resolving the spectral singularities for small values of an asymmetry parameter η was determined. Our results show that the method of random sampling of a nutation interferogram allows significant reduction of time required to perform a 2-D nutation experiment and does not worsen the spectral resolution.

The Geometrical Phase in the PEANUT Experiments for the NQR Spectroscopy for the Spins I = 3/2

“…8). The advantage of the PEANUT method over traditional nutation experiment is that the line of the nutation spectrum is at doubled nutation frequency, which improves resolution of the nutation singularities for small g. The minimum asymmetry parameter, which can be determined from the nutation PEANUT experiment is given by the expression [27]: g min ¼ ffiffi 3 p m r T , where m r ¼ cB 1 =2p, T is the duration of the HTA pulse.…”