Improved quantitation in 3QMAS of spin 5/2 nuclei by RF power modulation of FAM-II.
High-resolution NMR of quadrupolar I = 5/2 nuclei using triple-quantum magic angle spinning (3QMAS) techniques can provide more accurate quantitative information on sites with small quadrupolar coupling constants by changing the pulse strength in addition to the pulse length in the FAM-II multiple-quantum conversion sequence. These effects are illustrated using (27)Al NMR of yttrium aluminium garnet and andalusite.
Gu
Jun
J
Department of Chemistry, University of Waterloo, 200 University Avenue West, Waterloo, Ont., Canada N2L 3G1.
Power
William P
WP
D000465:Algorithms; D000535:Aluminum / Q000032:analysis / Q000737:chemistry*; D017607:Aluminum Compounds / Q000032:analysis* / Q000737:chemistry*; D000538:Aluminum Silicates / Q000032:analysis / Q000737:chemistry; D003198:Computer Simulation; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008956:Models, Chemical; D011846:Radio Waves; D011868:Radioisotopes / Q000032:analysis / Q000737:chemistry*; D012815:Signal Processing, Computer-Assisted; D013113:Spin Labels
D017607:Aluminum Compounds; D000538:Aluminum Silicates; D011868:Radioisotopes; D013113:Spin Labels; C121090:andalusite; D000535:Aluminum