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Quantitative measurement of rare spins in solid state cross polarization NMR

✍ Scribed by Shanmin Zhang; Xiaoling Wu; Huiping Zhang; Xuewen Wu

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
319 KB
Volume
165
Category
Article
ISSN
0009-2614

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✦ Synopsis

Quantitative measurement of the relative number of rare spins of individual lines in solid state cross polarization NMR has been hampered by the spin-latlice relaxation in the rotating frame and the finite and different cross polarization transfer rates. In this article a simple method which combines the standard polarization with depolarization of rare spins is suggested. It offers a reliable approach to obtaining quantitative analytical data without intensity distortion, when the lines considered are well separated. Experimental data obtained with glycine and o-toluic acid are shown to be in fair agreement with the known values.

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