Communication: Hot-atom abstraction dynamics of hydrogen from tungsten surfaces: The role of surface structure

Adiabatic and non-adiabatic quasiclassical molecular dynamics simulations are performed to investigate the role of the crystal face on hot-atom abstraction of H adsorbates by H scattering from covered W(100) and W(110). On both cases, hyperthermal diffusion is strongly affected by the energy dissipated into electron-hole pair excitations. As a result, the hot-atom abstraction is highly reduced in favor of adsorption at low incidence energy and low coverages, i.e., when the mean free path of the hyperthermal H is typically larger. Qualitatively, this reduction is rather similar on both surfaces, despite at such initial conditions, the abstraction process involves more subsurface penetration on W(100) than on W(110).Fil: Galparsoro, Oihana. Centre National de la Recherche Scientifique. Institut des Textes et Manuscrits Modernes; Francia. Institut Des Sciences Moleculaires; Francia. Universite de Bordeaux; Francia. Donostia International Physics Center; EspañaFil: Busnengo, Heriberto Fabio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; ArgentinaFil: Juaristi, Joseba Iñaki. Donostia International Physics Center; España. Universidad del País Vasco; España. Consejo Superior de Investigaciones Científicas; EspañaFil: Crespos, Cédric. Institut Des Sciences Moleculaires; Francia. Centre National de la Recherche Scientifique. Institut des Textes et Manuscrits Modernes; Francia. Universite de Bordeaux; FranciaFil: Alducin, Maite. Consejo Superior de Investigaciones Científicas; España. Donostia International Physics Center; EspañaFil: Larregaray, Pascal. Centre National de la Recherche Scientifique. Institut des Textes et Manuscrits Modernes; Francia. Institut Des Sciences Moleculaires; Francia. Universite de Bordeaux; Franci