On the NQR detection of nitrogenated substances by multi‐pulse sequences

Abstract

Abstract Theoretical and practical aspects of using multi‐pulse spin‐locking and the “strong off‐resonant comb” (SORC) sequence for detecting nitrogenated substances by the nuclear quadrupole resonance method were studied. A number of optimum correlations between the parameters of multi‐pulse sequences and the relaxation characteristics of the substances under investigation were determined. The obtained relations were used for the fast detection of α‐trinitrotoluene (TNT). Relaxation parameters and temperature coefficients for twelve 14 N lines of the orthorhombic phase of TNT measured at room temperature are also presented. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)