Abstract
We here compare the T2′ values of various heteronuclear dipolar decoupling schemes commonly used in solid-state nuclear magnetic resonance experiments. Swept-frequency two-pulse phase modulation scheme is shown to give longer T2′ values for the majority of the magic-angle-spinning frequencies and radiofrequency amplitudes considered here. The longer T2′ values obtained are shown to yield spectra with higher resolution in experiments, such as INADEQUATE, which incorporate spin-echo blocks. Such blocks normally constitute the indirect dimension of a multidimensional experiment during which heteronuclear dipolar decoupling is applied, thereby making the relevance of T2′ manifest clearly. Experimental results are shown on samples of glycine, alanine, and Aβ42.
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