Partially relaxed Fourier transform spectra

In other 13C studies of raffinose, stachyose,170 various vitamin B12 derivatives,171 and the anomeric equilibria of D-fructose and D-turanose in aqueous solution,172 partially relaxed, Fourier-transform spectra, and the values of obtained from them, have been elegantly used to confirm the spectral assignments. The T, values of the 13C nuclei of thermally denatured, yeast fRNA indicate that its D-ribose phosphate backbone undergoes rapid segmental motion at 81°. In contrast, the values of Tx for folded fRNA yielded no evidence of segmental motion.1720... 

We now consider the problem of determining the T s of individual lines in a multi-line high resolution spectrum. The partially relaxed Fourier transform (PRFT) method, first performed by Void, et al. (1968), works very well for this purpose. It is basically the inversion recovery sequence except that after the second pulse the partially relaxed FID is Fourier transformed to yield a partially relaxed spectrum. 

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