Abstract
Average-Hamiltonian theory is used to design novel NMR pulse sequences that achieve uniform and efficient excitation of multiple-quantum coherence over a range of spin couplings. In contrast to a previous approach based on an analogy with composite pulses, the present method can be used to generate pulse sequences that are effective for quite complex spin systems, such as (a) three, four, or more weakly scalar-coupled spin I = 1 2 nuclei or (b) an isolated quadrupolar nucleus with spin I = 3 2 , or greater in a solid or liquid-crystalline environment. The limitations of these broadband multiple-quantum excitation sequences are discussed.
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