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Measurement of spin-lattice relaxation times of 13C in organic solids

✍ Scribed by Jinyuan Zhou; Riqiang Fu; Jian Zhi Hu; Liyun Li; Chaohui Ye

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
713 KB
Volume
7
Category
Article
ISSN
0926-2040

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✦ Synopsis

A transient nuclear Overhauser effect (NOE) makes measurements of the 13C spin-lattice relaxation times in organic solids complicated. Extended Solomon equations are applied in order to describe 13C spin-lattice relaxation with 'H r.f. field irradiation. Spin-lattice relaxation under r.f. irradiation is shown to be generally a triple-exponential process, but it can be reduced to be single-exponential under stronger r.f. field irradiation as well as in the absence of ' H initial magnetizations.

Based on numerical calculations, the difference between spin-lattice relaxation curves obeying TF < Tr and those obeying TIC > TIH is clearly indicated. The methyl group resonances in solid-state L-valine are examined, and the experimental results agree well with the theoretical results. 0 1997 Elsevier Science B.V.

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