Sensitivity enhancement for NMR of the central transition of quadrupolar nuclei

A sensitivity enchancement technique for the central transition of half-integer nuclear spins is reported. For a spin-I the largest and smallest thermal equilibrium populations, in the m = ± I levels, are transferred to the m = − 12. The resulting signal enhancement of the central transition is of m...

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Bibliographic Details
Published inChemical physics letters Vol. 209; no. 3; pp. 287 - 291
Main Authors Haase, Jürgen, Conradi, Mark S.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 02.07.1993
Elsevier Science
Subjects
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Nuclear magnetic resonance and relaxation
Physics
Quadrupole resonance
Free induction
Spin lattice relaxation
Satellite line
Quadrupolar transition
Experimental study
Quadrupolar interaction
Single crystal
Powder
Inorganic compound
Magic angle
Aluminium Oxides
Corundum
Nuclear magnetic resonance
Charge transfer
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Summary:A sensitivity enchancement technique for the central transition of half-integer nuclear spins is reported. For a spin-I the largest and smallest thermal equilibrium populations, in the m = ± I levels, are transferred to the m = − 12. The resulting signal enhancement of the central transition is of maximum value 2I. The population transfer is accomplished by frequency or field sweeping, resulting in sequential adiabatic inversions of the satellite transitions. Thus, the technique works on powder and amorphous samples as well as on single crystals, as demonstrated in experiments on 27Al in Al2O3.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(93)80109-3