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Circular Polarization Excitation and Detection in 14N NQR

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Abstract:

Circular polarization excitation and detection of 14N NQR signal are reported. A theoretical model is presented in terms of fictitious spin-1/2 operators and is compared to experiments performed on a powder crystalline sample of RDX. It is shown that in spin-1 systems with finite asymmetry—unlike previously reported NMR and symmetric spin-3/2 NQR systems (Chen et al., J. Magn. Reson. 54, 324–327, 1983; Weber and Hahn, Phys. Rev. 120, 365–375, 1960)—the circular polarization nature of the signal is due to powder orientation effects in polycrystalline samples. Sensitivity improvements up to a factor of √2 are reported using the same hardware and switching modes from linear polarization to circular polarization; this also is shown to result from the polycrystalline nature of the samples.

Document Type: Research Article

Affiliations: Quantum Magnetics, Inc., 7740 Kenamar Court, San Diego, California, 92121

Publication date: February 1, 2001

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