title: Producing and quantifying enriched para-H2.
abstract: The production of enriched para-H(2) is useful for many scientific applications, but the technology for producing and measuring para-H(2) 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-H(2) enrichments of up to > or = 99.99% at continuous flow rates of up to 0.4 SLM. We also discuss para-H(2) storage and back conversion rates, and improvements to three techniques (thermal conductance, NMR, and solid hydrogen impurity spectroscopy) used to quantify the para-H(2) enrichment.
authors.affiliation: Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
authors.forename: Brian A
authors.initials: BA
authors.lastname: Tom
authors.forename: Siddhartha
authors.initials: S
authors.lastname: Bhasker
authors.forename: Yuki
authors.initials: Y
authors.lastname: Miyamoto
authors.forename: Takamasa
authors.initials: T
authors.lastname: Momose
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: McCall