Abstract
Long phase programs are becoming more and more common in multipulse NMR. Unfortunately they often require tedious step-by-step computations and lead to clumsy tabular presentations. A handy and efficient concept is presented here, which assigns a phase program to each pulse in a sequence, and treats them as a whole. This new entity, called a “screw pulse,” also provides a framework for the overall understanding of phase programs already used in classic sequences. The description of this new tool uses a formalism which represents the evolution of the spin system in terms of n-quantum transitions; conventional pulse sequences are then reexamined to illustrate the implementation of this concept.
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