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Journal of Chemical Physics / Volume 129 / Issue 22 / ARTICLES / Condensed Phase Dynamics, Structure, and Thermodynamics: Spectroscopy, Reactions, and Relaxation

J. Chem. Phys. 129, 224510 (2008); http://dx.doi.org/10.1063/1.3036005 (6 pages)

Optimal nuclear magnetic resonance excitation schemes for the central transition of a spin 3/2 in the presence of residual quadrupolar coupling

Jae-Seung Lee1,2, Ravinder R. Regatte2, and Alexej Jerschow1

1Department of Chemistry, New York University, New York, New York 10003, USA
2Radiology Department, Center for Biomedical Imaging, New York University School of Medicine, New York, New York 10003, USA

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(Received 24 July 2008; accepted 5 November 2008; published online 12 December 2008)

Optimal control theory is applied for enhancing the intensity of the central peak of a spin 3/2 signal in the presence of a residual quadrupolar coupling. While a maximum enhancement is always possible in the regime ωrf⪡ωQ via the use of modulated and shaped pulses, the intermediate rf-power regime ωrf ∼ ωQ does not admit simple solutions based on intuition. In this work we present optimized shaped pulses that have been derived using an optimization algorithm based on optimal control and test these with 23Na NMR in this regime. In addition to enhancing the intensity of the central transition signal, the satellite peaks can be effectively suppressed, which is a useful feature for the implementation in 23Na imaging sequences.

© 2008 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. THEORY
  3. RESULTS
  4. EXPERIMENTAL TEST
  5. DISCUSSION
  6. CONCLUSION

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KEYWORDS and PACS

Keywords

nuclear magnetic resonance, quadrupole coupling, sodium, spectral line intensity

PACS

  • 33.25.+k

    Nuclear resonance and relaxation

  • 33.70.Fd

    Absolute and relative line and band intensities

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3036005

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    E. M. Fortunato, M. A. Pravia, N. Boulant, G. Teklemariam, T. F. Havel, and D. G. Cory, J. Chem. Phys. 116, 7599 (2002)JCPSA6000116000017007599000001.

    D. N. Sobieski, N. R. Krueger, S. Vyas, and M. P. Augustine, J. Chem. Phys. 125, 244509 (2006)JCPSA6000125000024244504000001.


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