Dynamical effects as a window into van der Waals interactions in fast He diffraction from KCl(001)
| Autor: | Bocan, G, Breiss, H, Szilasi, S, Momeni, A, Staicu Casagrande, E, Sánchez, E, Gravielle, M, Khemliche, Hocine |
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| Přispěvatelé: | Institut des Sciences Moléculaires d'Orsay (ISMO), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Physical Review B Physical Review B, American Physical Society, 2021, 104, ⟨10.1103/PhysRevB.104.235401⟩ |
| ISSN: | 2469-9950 2469-9969 |
| DOI: | 10.1103/PhysRevB.104.235401⟩ |
| Popis: | International audience; In this work we address, both experimentally and theoretically, the very grazing scattering of He atoms off KCl(001) with incidence along the 100 channel. Our theoretical model combines a semiquantum description of the scattering dynamics and a high-precision interaction potential. By means of a thorough analysis of the quantum phase for in-plane scattering and rainbow trajectories, we are able to connect the presence of the physisorption well with the significant enhancements of the corrugation and rainbow angle, relative to the hard corrugated wall predictions. We trace this connection to dynamical effects on the incident and scattered beams due to their traversing of the physisorption well. Finally, we show that the inclusion of vdW interactions in the potential improves the theoretical accord with experiments for both the corrugation and the rainbow angle. |
| Databáze: | OpenAIRE |
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