POPULATION TRANSFERS FOR NMR OF QUADRUPOLAR SPINS IN SOLIDS

被引：53
作者：
HAASE, J
CONRADI, MS
GREY, CP
VEGA, AJ
机构：
[1] WASHINGTON UNIV,DEPT PHYS 1105,ST LOUIS,MO 63130
[2] DUPONT CO INC,CENT RES & DEV,EXPTL STN,WILMINGTON,DE 19880
来源：
JOURNAL OF MAGNETIC RESONANCE SERIES A | 1994年 / 109卷 / 01期
关键词：
D O I：
10.1006/jmra.1994.1138
中图分类号：
O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号：
070203 ; 070304 ; 081704 ; 1406 ;
摘要：
The manipulation of spin-state populations is investigated for quadrupolar nuclei with pulsed and frequency-swept RF fields. The frequency-sweep method is an effective way to interchange the populations of two levels and does not require exact knowledge of the transition frequency. Results for allowed (Delta m = 1) and forbidden transitions (Delta m > 1) are reported for Al-27 in a single crystal Al2O3. The behavior of the higher-order transitions establishes a lower limit for the sweep rate for sensitivity enhancement of the central transition for powders and amorphous solids. (C) 1994 Academic Press, Inc.
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页码：90 / 97
页数：8
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