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Unformatted text preview: Downloaded 16 Nov 2006 to 130.203.197.202. Redistribution subject to AIP license or copyright, see http://jcp.aip.org/jcp/copyright.jsp Downloaded 16 Nov 2006 to 130.203.197.202. Redistribution subject to AIP license or copyright, see http://jcp.aip.org/jcp/copyright.jsp Downloaded 16 Nov 2006 to 130.203.197.202. Redistribution subject to AIP license or copyright, see http://jcp.aip.org/jcp/copyright.jsp Downloaded 16 Nov 2006 to 130.203.197.202. Redistribution subject to AIP license or copyright, see http://jcp.aip.org/jcp/copyright.jsp Downloaded 16 Nov 2006 to 130.203.197.202. Redistribution subject to AIP license or copyright, see http://jcp.aip.org/jcp/copyright.jsp Downloaded 16 Nov 2006 to 130.203.197.202. Redistribution subject to AIP license or copyright, see http://jcp.aip.org/jcp/copyright.jsp Downloaded 16 Nov 2006 to 130.203.197.202. Redistribution subject to AIP license or copyright, see http://jcp.aip.org/jcp/copyright.jsp Downloaded 16 Nov 2006 to 130.203.197.202. Redistribution subject to AIP license or copyright, see http://jcp.aip.org/jcp/copyright.jsp Downloaded 04 Feb 2006 to 130.203.197.202. Redistribution subject to AIP license or copyright, see http://jcp.aip.org/jcp/copyright.jsp Downloaded 04 Feb 2006 to 130.203.197.202. Redistribution subject to AIP license or copyright, see http://jcp.aip.org/jcp/copyright.jsp Spin dynamics in the pulsed spin locking of nuclear quadrupole resonance K. L. Sauer * George Mason University, Fairfax, Virginia 22030, USA C. A. Klug Code 6122, Naval Research Laboratory, Washington, D.C. 20375, USA s Received 9 January 2006; revised manuscript received 4 April 2006; published 9 November 2006 d We theoretically examine the perturbative effects of a series of radio-frequency s rf d pulses, electric field gradient inhomogeneity, and dipole-dipole coupling on the spin dynamics of spin-1 nuclei dominated by the quadrupole interaction. The dipole-dipole coupling is between neighboring spin-1 nuclei with identical nuclear quadrupole resonance frequencies, but the principal axes frames of the electric field gradient at each nucleus are not aligned. Such a comprehensive treatment is necessary to determine the optimal sequence of rf pulses which maximizes the echoes in the detection of the substance of interest, for example, an explosive or other contraband material. We confirm our theoretical model using the nitrogen in powder samples of p-chloroaniline and sodium nitrite. DOI: 10.1103/PhysRevB.74.174410 PACS number s s d : 76.60.Gv, 82.56.Jn, 76.60.Lz, 75.40.Mg Nuclear quadrupole resonance s NQR d extends the prom- ise of simple detection of quadrupole nuclei within crystal- line samples, since neither an electric nor a magnetic static field needs to be applied....
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