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Title: Analysis of hydrogen adsorption and surface binding configuration on tungsten using direct recoil spectrometry

Journal Article · · Journal of Nuclear Materials
 [1];  [2];  [1];  [1];  [2]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
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In our work, we apply low energy ion beam analysis to examine directly how the adsorbed hydrogen concentration and binding configuration on W(1 0 0) depend on temperature. We exposed the tungsten surface to fluxes of both atomic and molecular H and D. We then probed the H isotopes adsorbed along different crystal directions using 1–2 keV Ne+ ions. At saturation coverage, H occupies two-fold bridge sites on W(1 0 0) at 25 °C. Moreover, the H coverage dramatically changes the behavior of channeled ions, as does reconstruction of the surface W atoms. For the exposure conditions examined here, we find that surface sites remain populated with H until the surface temperature reaches 200 °C. Then, we observe H rapidly desorbing until only a residual concentration remains at 450 °C. Development of an efficient atomistic model that accurately reproduces the experimental ion energy spectra and azimuthal variation of recoiled H is underway.

Research Organization:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC04-94AL85000; SC00-02060
OSTI ID:
1145778
Alternate ID(s):
OSTI ID: 1252242
Report Number(s):
SAND-2014-4300J; PII: S0022311514009222
Journal Information:
Journal of Nuclear Materials, Vol. 463, Issue C; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

References (10)

Low-energy ion scattering at surfaces journal May 1993
Channeling of low-energy ions on hydrogen-covered single-crystal surfaces journal March 2012
Temperature dependence of D atom adsorption on polycrystalline tungsten journal October 2013
Hydrogen interactions with quasicrystalline Al–Pd–Mn surfaces journal February 2006
Quantitative characterization of a highly effective atomic hydrogen doser journal September 1998
Interaction of atomic hydrogen with metal surfaces journal December 1998
Slowing-down time of energetic atoms in solids journal December 1989
Hydrogen on Tungsten(100): Adsorbate-Induced Surface Reconstruction journal November 1978
Clean and Adsorbate-Induced Surface Phase Transitions on W{100} journal January 1983
Simulation of ballistic effects during scattering under glancing angles of incidence from crystal surfaces journal February 1996

Cited By (3)

Surface coverage dependent mechanisms for the absorption and desorption of hydrogen from the W(1 1 0) and W(1 0 0) surfaces: a density functional theory investigation journal August 2019
Hydrogen interactions with low-index surface orientations of tungsten journal April 2019
A density functional theory based thermodynamic model of hydrogen coverage on the W(110) surface journal January 2020

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS