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

Jae Seung Lee; Ravinder R. Regatte; Alexej Jerschow

doi:10.1063/1.3036005

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

Jae Seung Lee, Ravinder R. Regatte, Alexej Jerschow

Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

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 ω_rf ω_Q via the use of modulated and shaped pulses, the intermediate rf-power regime ω_rf ∼ ω_Q 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.

Original language	English (US)
Article number	224510
Journal	Journal of Chemical Physics
Volume	129
Issue number	22
DOIs	https://doi.org/10.1063/1.3036005
State	Published - 2008

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1063/1.3036005

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

abstract = "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.",

author = "Lee, {Jae Seung} and Regatte, {Ravinder R.} and Alexej Jerschow",

note = "Funding Information: We acknowledge funding from the Bayer HealthCare Pharmaceuticals (formerly Berlex Laboratories), as well as from the U.S. National Science Foundation under Grant No. 0554400. The authors thank A. K. Khitrin for discussions and P. Rong for sample preparation.",

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AU - Lee, Jae Seung

AU - Regatte, Ravinder R.

AU - Jerschow, Alexej

N1 - Funding Information: We acknowledge funding from the Bayer HealthCare Pharmaceuticals (formerly Berlex Laboratories), as well as from the U.S. National Science Foundation under Grant No. 0554400. The authors thank A. K. Khitrin for discussions and P. Rong for sample preparation.

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

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