Controlling coherence using the internal structure of hard pi pulses.
The tiny difference between hard pi pulses and their delta-function approximation can be exploited to control coherence. Variants on the magic echo that work despite a large spread in resonance offsets are demonstrated using the zeroth- and first-order average Hamiltonian terms, for 13C NMR in 60C. The 29Si NMR linewidth of silicon has been reduced by a factor of about 70,00 using this approach, which also has potential applications in magnetic resonance microscopy and imaging of solids.
Dong
Yanqun
Y
Department of Physics, Yale University, New Haven, Connecticut 06511, USA.
Ramos
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Li
Dale
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Barrett
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