A continuously recirculating optical pumping apparatus for high xenon polarization and surface NMR studies

被引：33

作者：

Knagge, K ^{[1
]}

Prange, J ^{[1
]}

Raftery, D ^{[1
]}

机构：

[1] Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA

来源：

CHEMICAL PHYSICS LETTERS | 2004年 / 397卷 / 1-3期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/j.cplett.2004.08.050

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 continuously recirculating xenon optical pumping apparatus was constructed and coupled to a 200 MHz NMR spectrometer. Steady-state Xe-129 polarizations as high as 69% were achieved approximately 5 min after circulation was begun, and this polarization is >3.5 times larger than observed for single pass operation. Using this apparatus, spin polarization induced nuclear Overhauser effect (SPINOE) experiments were performed on porous silicon samples and on (CD3OD)-C-13 adsorbed on TiO2-coated optical fibers to evaluate the capabilities of the system for studying low surface areas samples. The C-13 enhancement achieved was approximately 14. The recirculating optical pumping system provides high xenon polarization at moderate laser powers for a variety of NMR studies. (C) 2004 Elsevier B.V. All rights reserved.

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页码：11 / 16

页数：6

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