Optimal nuclear magnetic resonance excitation schemes for the central transition of a spin 3/2 in the presence of residual quadrupolar coupling.
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 omega(rf) << omega(Q) via the use of modulated and shaped pulses, the intermediate rf-power regime omega(rf)-omega(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 (23)Na 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 (23)Na imaging sequences.
Lee
Jae-Seung
JS
Department of Chemistry, New York University, New York, New York 10003, USA.
Regatte
Ravinder R
RR
Jerschow
Alexej
A
D000465:Algorithms; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D012964:Sodium / Q000737:chemistry
D012964:Sodium