title: Nuclear quadrupole resonance of methamphetamine hydrochloride.
abstract: The pulsed nuclear quadrupole resonance method was used to search for the NQR frequencies of (14)N in methamphetamine hydrochloride based on quantum chemical estimates. The NQR spectrum peaks were observed at ν(+)=1.217 MHz and ν(-)=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 ν(+) and ν(-) 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.
authors.affiliation: Graduate school of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan. sinohara@sup.ee.es.osaka-u.ac.jp
authors.forename: Junichiro
authors.initials: J
authors.lastname: Shinohara
authors.forename: Hideo
authors.initials: H
authors.lastname: Sato-Akaba
authors.forename: Hideo
authors.initials: H
authors.lastname: Itozaki