Controlling coherence using the internal structure of hard pi pulses
arXiv:0804.3087 · doi:10.1103/PhysRevLett.100.247601
Abstract
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 13-C NMR in C60. The 29-Si NMR linewidth of Silicon has been reduced by a factor of about 70,000 using this approach, which also has potential applications in magnetic resonance microscopy and imaging of solids.
4 pages, 4 color figures
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