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Single molecule fluorescence experiments, with their associated low signals, require very low background fluorescence in the sample. Even high purity liquids will often possess large numbers of fluore...

Producing and quantifying enriched para-H2

Rev. Sci. Instrum. 80, 016108 (2009); doi:10.1063/1.3072881

Published 30 January 2009

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Brian A. Tom,1 Siddhartha Bhasker,1 Yuki Miyamoto,2 Takamasa Momose,2 and Benjamin J. McCall1,3
1Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
2Department of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
3Department of Astronomy, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
The production of enriched para-H2 is useful for many scientific applications, but the technology for producing and measuring para-H2 is not yet widespread. In this note and in the accompanying auxiliary material, we describe the design, construction, and use of a versatile standalone converter that is capable of producing para-H2 enrichments of up to >=99.99% at continuous flow rates of up to 0.4 SLM. We also discuss para-H2 storage and back conversion rates, and improvements to three techniques (thermal conductance, NMR, and solid hydrogen impurity spectroscopy) used to quantify the para-H2 enrichment. ©2009 American Institute of Physics
History: Received 26 September 2008; accepted 29 December 2008; published 30 January 2009
Permalink: http://link.aip.org/link/?RSINAK/80/016108/1

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Supplemental Material

KEYWORDS and PACS

Keywords
PACS
  • 84.60.-h
    Direct energy conversion and energy storage
  • 76.60.-k
    Nuclear magnetic resonance and relaxation (condensed matter)
  • 66.70.-f
    Nonelectronic thermal conduction and heat-pulse propagation in solids
  • 67.80.F-
    Solids of hydrogen and isotopes
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0034-6748 (print)   1089-7623 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (24)
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