摘要
The pulsed nuclear quadrupole resonance method was used to search for the NQR frequencies of 14N in methamphetamine hydrochloride based on quantum chemical estimates. The NQR spectrum peaks were observed at 谓+=1.217 MHz and 谓鈭?/sub>=0.654 MHz. The temperature dependences of the NQR frequencies and relaxation properties were investigated for the purpose of stand-off sensing of illicit drugs. The NQR frequency shifts for 谓+ and 谓鈭?/sub> were approximately 0.22 kHz/K and 0.10 kHz/K, respectively, around room temperature. The spin-lattice relaxation times and spin-phase memory times were 8.3 ms-10.0 ms and 0.65 ms -0.86 ms, respectively.