Secondary signals in two-frequency nuclear quadrupole resonance on 14N nuclei with I=1

Abstract

Our experimental and theoretical studies show that using two-frequency excitation of N-14 nuclei it is possible to observe secondary NQR signals at one of the three possible transitions due to irradiation of another adjacent transition. As a result of the pulse sequence applied to the adjacent transition the spin-echo signals on the detected transition are observed after essential time interval from the initial single pulse on this frequency. Experiments have been performed on the N-14-nuclei in the sodium nitrite (NaNO2) and the military explosive hexahydro-1,3,5-trinitro-s-triazine C3H6N6O6 (RDX). (c) 2008 Elsevier Inc. All rights reserved.