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Title

Reactive and nonreactive scattering of HCl from Au(111): An Ab initio molecular dynamics study

AuthorsFüchsel, Gernot; Zhou, Xueyao; Jiang, Bin; Juaristi Oliden, Joseba Iñaki ; Alducin Ochoa, Maite ; Guo, Hua; Kroes, Geert-Jan
Issue Date2019
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry C 123(4): 2287-2299 (2019)
AbstractThe HCl + Au(111) system has recently become a benchmark for highly activated dissociative chemisorption, which presumably is strongly affected by electron–hole pair excitation. Previous dynamics calculations, which were based on density functional theory at the generalized gradient approximation level (GGA-DFT) for the molecule–surface interaction, have all overestimated measured reaction probabilities by at least an order of magnitude. Here, we perform ab initio molecular dynamics (AIMD) and AIMD with electronic friction (AIMDEF) calculations employing a density functional that includes the attractive van der Waals interaction. Our calculations model the simultaneous and possibly synergistic effects of surface temperature, surface atom motion, electron–hole pair excitation, the molecular beam conditions of the experiments, and the van der Waals interaction on the reactivity. We find that reaction probabilities computed with AIMDEF and the SRP32-vdW functional still overestimate the measured reaction probabilities, by a factor 18 for the highest incidence energy at which measurements were performed (≈2.5 eV). Even granting that the experiment could have underestimated the sticking probability by about a factor three, this still translates into a considerable overestimation of the reactivity by the current theory. Likewise, scaled transition probabilities for vibrational excitation from ν = 1, j = 1 to ν = 2 are overestimated by the AIMDEF theory, by factors 3–8 depending on the initial conditions modeled. Energy losses to the surface and translational energy losses are, however, in good agreement with experimental values.
Publisher version (URL)https://doi.org/10.1021/acs.jpcc.8b10686
URIhttp://hdl.handle.net/10261/178590
DOI10.1021/acs.jpcc.8b10686
ISSN1932-7447
E-ISSN1932-7455
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