Abstract
Low energy ion recoil spectroscopy is a powerful technique for the determination of adsorbate position on metal surfaces. In this study, this technique is employed to compare the adsorption sites of hydrogen and deuterium on Pd(100) by detection of either H or D recoil ions produced by Ne+ bombardment. Comparisons of experimental and Kalypso simulated azimuthal yield distributions show that, at room temperature, both hydrogen isotopes are adsorbed in the fourfold hollow site of Pd(100), however, at different heights above the surface (H-0.20 Å and D-0.25 Å). The adsorbates remain in the hollow site at all temperatures up to 383 K even though they move up to 0.40-0.45 Å above the surface. Density functional theory calculations show a similar coverage dependent adsorption height for both H and D and confirm a real difference between the H and D adsorption heights based on zero point energies.
| Original language | English |
|---|---|
| Article number | 024714 |
| Journal | Journal of Chemical Physics |
| Volume | 132 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2010 Jan 25 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry
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Comparison of hydrogen and deuterium adsorption on Pd(100). / Gladys, M. J.; Kambali, I.; Karolewski, M. A.; Soon, A.; Stampfl, C.; O'Connor, D. J.
In: Journal of Chemical Physics, Vol. 132, No. 2, 024714, 25.01.2010.Research output: Contribution to journal › Article
TY - JOUR
T1 - Comparison of hydrogen and deuterium adsorption on Pd(100)
AU - Gladys, M. J.
AU - Kambali, I.
AU - Karolewski, M. A.
AU - Soon, A.
AU - Stampfl, C.
AU - O'Connor, D. J.
PY - 2010/1/25
Y1 - 2010/1/25
N2 - Low energy ion recoil spectroscopy is a powerful technique for the determination of adsorbate position on metal surfaces. In this study, this technique is employed to compare the adsorption sites of hydrogen and deuterium on Pd(100) by detection of either H or D recoil ions produced by Ne+ bombardment. Comparisons of experimental and Kalypso simulated azimuthal yield distributions show that, at room temperature, both hydrogen isotopes are adsorbed in the fourfold hollow site of Pd(100), however, at different heights above the surface (H-0.20 Å and D-0.25 Å). The adsorbates remain in the hollow site at all temperatures up to 383 K even though they move up to 0.40-0.45 Å above the surface. Density functional theory calculations show a similar coverage dependent adsorption height for both H and D and confirm a real difference between the H and D adsorption heights based on zero point energies.
AB - Low energy ion recoil spectroscopy is a powerful technique for the determination of adsorbate position on metal surfaces. In this study, this technique is employed to compare the adsorption sites of hydrogen and deuterium on Pd(100) by detection of either H or D recoil ions produced by Ne+ bombardment. Comparisons of experimental and Kalypso simulated azimuthal yield distributions show that, at room temperature, both hydrogen isotopes are adsorbed in the fourfold hollow site of Pd(100), however, at different heights above the surface (H-0.20 Å and D-0.25 Å). The adsorbates remain in the hollow site at all temperatures up to 383 K even though they move up to 0.40-0.45 Å above the surface. Density functional theory calculations show a similar coverage dependent adsorption height for both H and D and confirm a real difference between the H and D adsorption heights based on zero point energies.
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U2 - 10.1063/1.3292686
DO - 10.1063/1.3292686
M3 - Article
VL - 132
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 2
M1 - 024714
ER -