Improved excitation schemes for multiple-quantum magic-angle spinning for quadrupolar nuclei designed using optimal control theory.
We have investigated the use of optimal control theory for the design of improved multiple-quantum excitation schemes for the popular multiple-quantum magic-angle spinning NMR experiment for quadrupolar nuclei with half-integer quadrupolar spin. The advantage of the new low-power experiments, termed OCFASTER, is demonstrated by sensitivity improvements approaching 50% for 87Rb in RbClO4 and RbNO3 as compared to FASTER and standard strong-pulse excitation schemes.
Vosegaard
Thomas
T
Center for Insoluble Protein Structures (inSPIN), University of Aarhus, DK-8000 Aarhus C, Denmark. tv@chem.au.dk
Kehlet
Cindie
C
Khaneja
Navin
N
Glaser
Steffen J
SJ
Nielsen
Niels Chr
NC
D003198:Computer Simulation; D009682:Magnetic Resonance Spectroscopy / Q000379:methods* / Q000592:standards; D008962:Models, Theoretical; D011786:Quality Control; D011789:Quantum Theory; D012015:Reference Standards; D012680:Sensitivity and Specificity