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The PASADENA Effect at a Solid Surface: High-Sensitivity Nuclear Magnetic Resonance of Hydrogen Chemisorption

Carson, Paul J. and Bowers, C. Russell and Weitekamp, Daniel P. (2001) The PASADENA Effect at a Solid Surface: High-Sensitivity Nuclear Magnetic Resonance of Hydrogen Chemisorption. Journal of the American Chemical Society, 123 (47). pp. 11821-11822. ISSN 0002-7863. https://resolver.caltech.edu/CaltechAUTHORS:20170406-074218760

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Abstract

The use of parahydrogen as a high-sensitivity spin label for nuclear magnetic resonance (NMR) was first proposed and then demonstrated to provide orders-of-magnitude signal enhancement in species which are formed from the molecular addition of hydrogen. The phenomenon known as the PASADENA effect (parahydrogen and synthesis allow dramatically enhanced nuclear alignment) derives from the fact that deviation of the parahydrogen mole fraction in a sample of H_2 from its statistical high-temperature limit of 1/4 is associated with an inherent form of spin order. Upon molecular addition of the two protons from a single H_2 molecule into coupled, magnetically inequivalent environments, this order is manifested as large nonequilibrium spin population differences across allowed NMR transitions.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/ja010572zDOIArticle
http://pubs.acs.org/doi/full/10.1021/ja010572zPublisherArticle
Additional Information:© 2001 American Chemical Society. Received 2 March 2001. Published online 3 November 2001. Published in print 1 November 2001.
Issue or Number:47
Record Number:CaltechAUTHORS:20170406-074218760
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170406-074218760
Official Citation:The PASADENA Effect at a Solid Surface:  High-Sensitivity Nuclear Magnetic Resonance of Hydrogen Chemisorption Paul J. Carson, C. Russell Bowers, and Daniel P. Weitekamp Journal of the American Chemical Society 2001 123 (47), 11821-11822 DOI: 10.1021/ja010572z
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75774
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:06 Apr 2017 16:43
Last Modified:03 Oct 2019 16:54

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