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- W2004354369 abstract "A 13 C spin-echo sequence with a single variable θ proton pulse coincident with the carbon refocusing pulse has been proposed which provides complete editing of a 13 C spectrum into separate quaternary, methine, methylene, and methyl subspectra. This sequence, named SEMUT, has been found to be as accurate as the DEPT sequence with regard to errors in the subspectra resulting from divergence of the single-bond 13 C 1 H coupling constant from the value assumed in setting the DEPT and SEMUT delay periods. In this paper, however, it is found that the similarity in the signal dependence of methine and methyl groups as a function of the θ pulse, and the additional complexity of the linear combinations of SEMUT spectra required for editing, leads to higher noise levels in the final subspectra for the SEMUT method as compared to the DEPT/q-only method. It is also shown that the basic SEMUT method is more sensitive to inhomogeneity and missetting of the θ pulse. Such inaccuracies, combined with the more complicated linear combinations, will make basic SEMUT more difficult to use. The problem of sensitivity to θ pulse missetting and inhomogeneity can be alleviated by a modification to the basic SEMUT sequence which unfortunately also removes its advantage as a minimal pulse number sequence not requiring phase control, but which gives very good insensitivity to moderate inhomogeneity. It is also found that other recently proposed editing methods have little, if any, more to offer than DEPT." @default.
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- W2004354369 date "1984-09-01" @default.
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- W2004354369 title "Signal-to-noise considerations and θ-pulse defects when editing 13C spectra. Comparison of DEPT and SEMUT" @default.
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- W2004354369 doi "https://doi.org/10.1016/0022-2364(84)90168-9" @default.
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