The multi-pulse method of detecting nuclear quadrupole resonance (NQR) in explosives containing polycrystalline RDX has been investigated. The following sequences were used: a spin-locking type sequence (SLS), a phase-alternated pulse sequence (PAPS) and a sequence without a preparatory pulse. The SLS, PAPS and strong off-resonance comb methods with the same parameters are of great interest for practical applications. The influence of the frequency offset on NQR signals in multi-pulse experiments was studied. [References: 14]
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