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Cylindrical spinner and speed controller for magic angle spinning nuclear magnetic resonance

 

作者: James N. Lee,   D. W. Alderman,   Jiang Yi Jin,   Kurt W. Zilm,   Charles L. Mayne,   Ronald J. Pugmire,   David M. Grant,  

 

期刊: Review of Scientific Instruments  (AIP Available online 1984)
卷期: Volume 55, issue 4  

页码: 516-520

 

ISSN:0034-6748

 

年代: 1984

 

DOI:10.1063/1.1137783

 

出版商: AIP

 

数据来源: AIP

 

摘要:

A new design for a cylindrical spinner suitable for magic angle spinning nuclear magnetic resonance (NMR) is described. The rotor has a large sample volume (0.66 cm3) and is capable of spinning speeds from 500 Hz to 5 kHz at drive gas pressures below 50 lb/in.2. The rotor is completely supported by gas bearings. Axial positioning is provided by the rotor’s T shape, leaving the bottom surface available for a photoelectric tachometer. The coil is wrapped on a form machined into the outer surface of the stator, producing a high filling factor. Also described is an instrument which controls the spinning speed of such a rotor to ±0.6 Hz around a set speed in the range of 3–4 kHz. The rotor’s speed is determined by means of a photoelectric tachometer. The instrument then compares this measured speed to the desired value and adjusts the gas flow to the rotor to correct any difference.

 

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