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Studies of Atomic Free Radicals Stored in a Cryogenic EnvironmentImpurity-Helium Solids are porous gel-like solids consisting of impurity atoms and molecules surrounded by thin layers of solid helium. They provide an ideal medium for matrix isolation of free radicals to prevent recombination and store chemical energy. In this work electron spin resonance, nuclear magnetic resonance, X-ray diffraction, and ultrasound techniques have all been employed to study the properties of these substances. Detailed studies via electron spin resonance of exchange tunneling chemical reactions involving hydrogen and deuterium molecular and atomic impurities in these solids have been performed and compared with theory. Concentrations of hydrogen approaching the quantum solid criterion have been produced. Structured studies involving X ray diffraction, ultrasound, and electron spin resonance have shown that the impurities in impurity helium solids are predominantly contained in impurity clusters, with each cluster being surrounded by thin layers of solid helium.
Document ID
20030033094
Acquisition Source
Headquarters
Document Type
Contractor or Grantee Report
Authors
Lee, David M. (Cornell Univ. Ithaca, NY, United States)
Hubbard, Dorthy (NASA Marshall Space Flight Center Huntsville, AL, United States)
Alexander, Glen (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
September 8, 2013
Publication Date
April 30, 2003
Subject Category
Atomic And Molecular Physics
Funding Number(s)
CONTRACT_GRANT: NAG8-1445
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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