Quantification of MQMAS spectra of solids containing quadrupolar nuclei

This work presents a method that can yield quantitative multi- quantum magi c-angle spinning (MQMAS) nuclear magnetic resonance (NMR) spectra by correc ting experimental spectra with numerical simulations. The most important so urces that cause non-quantitative MQMAS spectra are identified and can be c alculated exactly. Therefore, the MQMAS spectra can be corrected with a num ber of intensity loss factors. Moreover, this method does not require inten sive RF fields, extensive pulse optimization or high spinning speeds, etc. The effectiveness of this method is verified by treating the Na-23 MQMAS sp ectra of a series of sodium compounds to yield almost the X-ray site quanti fication. (C) 1999 Elsevier Science B.V. All rights reserved.