VARIABLE-EFFECTIVE-FIELD CROSS-POLARIZATION - AN APPROACH TO BROAD-BAND HARTMANN-HAHN MATCHING IN MAS NMR

被引：20

作者：

KOLBERT, AC ^{[1
]}

GANN, SL ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720

来源：

CHEMICAL PHYSICS LETTERS | 1994年 / 224卷 / 1-2期

关键词：

D O I：

10.1016/0009-2614(94)00542-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A method for broadening the Hartmann-Hahn matching condition for cross polarization under magic angle spinning is presented. Variable-effective-field cross polarization (VEFCP) employs different effective radio-frequency (rf) fields on the H-1 channel during mixing, while the C-13 rf field remains constant. VEFCP is shown to result in both a broader matching condition, and a more rapid polarization transfer than ordinary cross polarization at the Hartmann-Hahn match. Experimental results on both adamantane and polycarbonate are discussed.

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页码：86 / 90

页数：5

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