Analysis of multiple-pulse techniques under fast MAS conditions.
The combination of magic-angle spinning and multiple-pulse sequences for line-narrowing in solids with homogeneous spin interactions is analyzed using Floquet theory. It is found that, for quasi-static conditions and for special synchronization conditions, line-narrowing is possible while for other conditions destructive interference of the two techniques takes place. However, even for optimum line-narrowing conditions, fundamental limitations with respect to the achievable linewidth are found, whereas the conditions of recoupling spin interactions are more easily realized. The implications of these results with respect to improving existing line-narrowing techniques or techniques for the design of specific Hamiltonians are discussed.
Filip
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C
National R&D Institute for Isotopic and Molecular Technologies, RO-3400 Cluj, Romania.
Hafner
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S
D000409:Alanine / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008433:Mathematics
D000409:Alanine