Multiple-quantum MAS NMR spectroscopy of spin-3/2 quadrupolar spin systems using shaped pulses spin systems using shaped pulses

被引:17
|
作者
Ding, SW [1 ]
McDowell, CA [1 ]
机构
[1] Univ British Columbia, Dept Chem, Vancouver, BC V6T 1Z1, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1006/jmre.1998.1552
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
An investigation of the effect of shaping the pulses in multiple-quantum magic-angle nuclear magnetic resonance experiments was carried out on polycrystalline samples containing spin-3/2 quadrupolar nuclear spins. Both theoretical analysis and numerical simulations show that there exist types of shaped pulses that are more advantageous than the usual rectangular pulses in exciting multiple-quantum coherences and converting these into single-quantum coherences or zero-quantum coherences (in z-filtering cases), The sensitivities can be enhanced without loss of resolution or increasing the RF offset dependences. Moreover, properly shaped pulses can moderate the requirements on the RF power and sample spinning speeds, Especially important for application purposes is the finding that lattice site quantification can also be improved by the use of certain shaped pulses. (C) 1998 Academic Press.
引用
收藏
页码:61 / 69
页数:9
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