NMR DOUBLE QUANTUM SPIN DECOUPLING IN SOLIDS

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The problem of spin decoupling spin I = 1 nuclei with large quadrupolar splittings {omega}{sub Q} (e.g. deuterium) from dilute S spins via double quantum transitions is dealt with. The normal two spin-1/2 single quantum decoupling problem (I = 1/2, S = 1/2) is first dealt with as a reminder of the coherent averaging approach and to understand the dependence of the S resonance linewidth on the I rf field intensity ({omega}{sub 1}) and resonance offset ({Delta}{omega}). The double quantum problem (I = 1, S = 1/2) is then treated analogously by introducting fictitious spin-1/2 operators for the I double ... continued below

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60 p.

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Pines, A.; Vega, S. & Mehring, M. October 1, 1977.

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The problem of spin decoupling spin I = 1 nuclei with large quadrupolar splittings {omega}{sub Q} (e.g. deuterium) from dilute S spins via double quantum transitions is dealt with. The normal two spin-1/2 single quantum decoupling problem (I = 1/2, S = 1/2) is first dealt with as a reminder of the coherent averaging approach and to understand the dependence of the S resonance linewidth on the I rf field intensity ({omega}{sub 1}) and resonance offset ({Delta}{omega}). The double quantum problem (I = 1, S = 1/2) is then treated analogously by introducting fictitious spin-1/2 operators for the I double quantum transition. The decoupling condition is found to be very sensitive to the spin-I resonance condition and to go as {approx} 1/4 with the spin I rf field intensity at resonance in the double quantum regime ({omega}{sub 1} << {omega}{sub Q}). Experimental examples on heavy ice, dimethyl-sulfoxide-d{sub 6} and benzene-d{sub 6} are presented verifying the quantitative theoretical predictions. Extensions to higher order multiple quantum effects for spin I > I and for several coupled spin-1/2 nuclei are discussed.

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60 p.

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  • Journal Name: Physical Review

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  • Report No.: LBL-6984
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1011241
  • Archival Resource Key: ark:/67531/metadc842065

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 1, 1977

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  • May 19, 2016, 3:16 p.m.

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  • July 26, 2016, 5:52 p.m.

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Pines, A.; Vega, S. & Mehring, M. NMR DOUBLE QUANTUM SPIN DECOUPLING IN SOLIDS, article, October 1, 1977; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc842065/: accessed June 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.