It is shown how the new technique of double-quantum filtered refocused electron spin-echoes is a significant improvement over double-quantum coherence ESR, since it increases the experimental acquisition time. This enables the measurement of longer distances in bilabeled biomolecules. The method is demonstrated on a long double-stranded A-type RNA, spin labeled at both ends. The measured distance of 72 A is in excellent agreement with molecular modeling.
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Borbat et al. (2004) studied this question.
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