AN EXACT SOLUTION OF A MAS FID IN TWO-SITE EXCHANGE PROBLEM

Chinese Journal of Magnetic Resonance ›› 1999, Vol. 16 ›› Issue (6): 485-493.

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AN EXACT SOLUTION OF A MAS FID IN TWO-SITE EXCHANGE PROBLEM

SHEN Yimin^1,2, Hironori KAJI², Fumitaka HORII²

1. Analytical Center, Fudsn University, Shanghai 200433;
2. Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan

Received:1999-08-17 Revised:1999-09-17 Published:1999-12-05 Online:2018-01-13
Supported by:
This work was financially supported by Grant 2974006 from the NSFC, by the foundation for returned scholar from the education ministry of China and by the Laboratory of MRAMP

Abstract

Abstract: An exact solution of a magic-angle-spinning free-induction-decay under two-siteexchange has been derived. The expression has been confirmed by comparing the calculated spinningsideband patterns for powdered crystalline dimethyl sulfone at different exchange rates with experimentally measured CP/MAS ¹³C NMR spectra at various temperatures. The information of themode and the site exchange rate constants of molecular motion can be provided by spectral line fittingbetween calculated and experimental spectra. The numerical calculations with this algorithm showthat the exchange effect results in a slight narrowing of the centerband and a slight broadening ofsidebands compared to the equal, linewidtbs without exchange.

Key words: NMR, Magic angle spinning, Two-site exchange, Exact solution

SHEN Yimin, Hironori KAJI, Fumitaka HORII. AN EXACT SOLUTION OF A MAS FID IN TWO-SITE EXCHANGE PROBLEM[J]. Chinese Journal of Magnetic Resonance, 1999, 16(6): 485-493.

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AN EXACT SOLUTION OF A MAS FID IN TWO-SITE EXCHANGE PROBLEM

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