Combination of proton-nitrogen level crossing polarization transfer and pulsed spin-locking sequence makes nuclear quadrupole resonance (NQR) in trinitrotoluene fast and sensitive enough to be used in routine detection of explosives. Enhancement factors for all three NQR lines (the case with ) were calculated and compared with experimental values. Good agreement between measured and calculated signal enhancement factors was observed. NQR signals in a trinitrotoluene sample of predominantly monoclinic modification were measured in in different polarization magnetic fields. The conditions for optimal proton-nitrogen level crossing were determined.
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