Abstract
Several factors relevant to the acquisition of heteronuclear shift-correlated spectra between indirectly bonded carbons and hydrogens are investigated. It is shown that the use of composite 13C pulses, the use of a selective 180° (BIRD) pulse at the midpoint of the final refocusing delay, optimization of fixed delays using modified INEPT sequences, and making the correct choice of acquisition parameters can all lead to significant improvements in sensitivity. The use of composite pulses also minimizes artifacts in cases where wide spectral windows are used.
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