Hydrogen in vacuum systems: an overview

DOIResolve DOI: http://doi.org/10.1063/1.1597372
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Proceedings titleHydrogen in Materials & Vacuum Systems: First International Workshop on Hydrogen in Materials and Vacuum Systems
Series titleAIP Conference Proceedings; no. 671
ConferenceFirst International Workshop on Hydrogen in Materials and Vacuum Systems, November 11-13, 2002, Newport News, Virginia, USA
Pages243254; # of pages: 12
AbstractHydrogen is the predominant residual gas in metal vacuum systems at very low pressures (i.e. in the utrahigh [uhv] and extreme high vacuum [xhv] ranges) and the reduction in the hydrogen outgassing rate is the most challenging problem in achieving xhv. Our understanding of the diffusion and adsorption/desorption processes involved in the outgassing of hydrogen from metals has much improved in recent years and has led to better methods for reducing the outgassing rates of hydrogen from metals such as stainless steel and aluminum alloys. This overview examines some recent advances in our understanding of the effects of hydrogen in vacuum systems; these include a) the adsorption/desorption/diffusion equilibrium at the vacuum-metal interface, b) the effects of multiple energy states of H atoms in the bulk metal, c) the physical adsorption of hydrogen on surfaces at cryogenic temperatures and d) the anomalous effects in pressure measurements of hydrogen with ionization gauges and residual gas analyzers.
Publication date
AffiliationNRC Institute for Microstructural Sciences; National Research Council Canada
Peer reviewedYes
NPARC number12346607
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Record identifier51158c7f-31c3-4df5-adc0-999a2f3cff8c
Record created2009-09-17
Record modified2016-05-09
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