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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 Laboratories (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1145778
Alternate ID(s):
OSTI ID: 22460780
OSTI ID: 1252242
Report Number(s):
SAND--2014-4300J; PII: S0022311514009222
Journal Information:
Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: C Vol. 463; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (10)

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

Cited By (3)

A density functional theory based thermodynamic model of hydrogen coverage on the W(110) surface journal January 2020
Hydrogen interactions with low-index surface orientations of tungsten journal April 2019
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

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Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS