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Bocan GA, Breiss H, Szilasi S, Momeni A, Staicu Casagrande EM, Sánchez EA, Gravielle MS, Khemliche H. Comment on "Perturbation theory of scattering for grazing-incidence fast-atom diffraction", by W. Allison, S. Miret-Artés and E. Pollak, Phys. Chem. Chem. Phys., 2022, 24, 15851. Phys Chem Chem Phys 2023. [PMID: 38047619 DOI: 10.1039/d3cp02486e] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
In this comment we discuss some aspects of Phys. Chem. Chem. Phys., 2022, 24, 15851, by Allison et al., an article intensely motivated by our study of grazing incidence fast atom diffraction (GIFAD) for He-KCl(001) [G. A. Bocan, H. Breiss, S. Szilasi, A. Momeni, M. E. Staicu Casagrande, M. S. Gravielle, E. A. Sánchez and H. Khemliche, Phys. Rev. Lett., 2020, 125, 096101; G. A. Bocan, H. Breiss, S. Szilasi, A. Momeni, M. E. Staicu Casagrande, E. A. Sánchez, M. S. Gravielle and H. Khemliche, Phys. Rev. B, 2021, 104, 235401]. In particular, (a) we show that, contrary to first order perturbation prediction, the surface corrugation is not proportional to the tangent of the rainbow angle and, (b) we analyze whether a Morse-like formula, like the one Allison et al. use, is able to reproduce the atom-surface potential derived from density functional theory (DFT) calculations. In addition, we give some clarifications regarding specific remarks the authors made about our articles.
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Affiliation(s)
- Gisela Anahí Bocan
- Instituto de Nanociencia y Nanotecnología - Nodo Bariloche (CNEA-CONICET), Centro Atómico Bariloche, Av. Bustillo 9500, S.C. de Bariloche 8400, Argentina.
| | - Hanadi Breiss
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405, Orsay, France
| | - Samir Szilasi
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405, Orsay, France
| | - Anouchah Momeni
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405, Orsay, France
- CY Cergy Paris Université, Cergy F-95000, France
| | | | - Esteban Alejandro Sánchez
- Instituto de Nanociencia y Nanotecnología - Nodo Bariloche (CNEA-CONICET), Centro Atómico Bariloche, Av. Bustillo 9500, S.C. de Bariloche 8400, Argentina.
- Instituto Balseiro (U. N. Cuyo), Centro Atómico Bariloche, Av. Bustillo 9500, S.C. de Bariloche 8400, Argentina
| | - María Silvia Gravielle
- Instituto de Astronomía y Física del Espacio (UBA-CONICET), Buenos Aires C1428EGA, Argentina.
| | - Hocine Khemliche
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405, Orsay, France
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Debiossac M, Pan P, Roncin P. Elastic and inelastic diffraction of fast neon atoms on a LiF surface. Phys Chem Chem Phys 2023; 25:30966-30974. [PMID: 37937541 DOI: 10.1039/d3cp04034h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
Grazing incidence fast atom diffraction has mainly been investigated with helium atoms, considered as the best possible choice for surface analysis. This article presents experimental diffraction profiles recorded with neon projectile, between 300 eV and 4 keV kinetic energy with incidence angles θi between 0.3 and 1.5° along three different directions of a LiF(001) crystal surface. These correspond to perpendicular energy ranging from a few meV up to almost 1 eV. A careful analysis of the scattering profile allows us to extract the diffracted intensities even when inelastic effects become so large that most quantum signatures have disappeared. The relevance of this approach is discussed in terms of surface topology.
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Affiliation(s)
- Maxime Debiossac
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay (ISMO), 91405 Orsay, France.
| | - Peng Pan
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay (ISMO), 91405 Orsay, France.
| | - Philippe Roncin
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay (ISMO), 91405 Orsay, France.
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Debiossac M, Pan P, Roncin P. Grazing incidence fast atom diffraction, similarities and differences with thermal energy atom scattering (TEAS). Phys Chem Chem Phys 2021; 23:7615-7636. [PMID: 33404037 DOI: 10.1039/d0cp05476c] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Grazing incidence fast atom diffraction (GIFAD) at surfaces has made rapid progress and has established itself as a surface analysis tool where effective energy E⊥ of the motion towards the surface is in the same range as that in thermal energy atom scattering (TEAS). To better compare the properties of both techniques, we use the diffraction patterns of helium and neon atoms impinging on a LiF (001) surface as a model system. E-Scan, θ-scan, and φ-scan are presented where the primary beam energy E is varied between a few hundred eV up to five keV, the angle of incidence θi between 0.2 and 2° and the azimuthal angle φi around 360°. The resulting diffraction charts are analyzed in terms of high and low values of effective energy E⊥. The former provides high resolution at the positions of the surface atoms and the attached repulsive interaction potentials while the second is sensitive to the attractive forces towards the surface. The recent progress of inelastic diffraction is briefly presented.
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Affiliation(s)
- Maxime Debiossac
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay (ISMO), 91405 Orsay, France.
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Bocan GA, Breiss H, Szilasi S, Momeni A, Casagrande EMS, Gravielle MS, Sánchez EA, Khemliche H. Anomalous KCl(001) Surface Corrugation from Fast He Diffraction at Very Grazing Incidence. PHYSICAL REVIEW LETTERS 2020; 125:096101. [PMID: 32915632 DOI: 10.1103/physrevlett.125.096101] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 07/31/2020] [Indexed: 06/11/2023]
Abstract
We present theoretical and experimental evidence of an anomalous surface corrugation behavior in He-KCl(001) for incidence along ⟨110⟩. When the He normal energy decreases below 100 meV, i.e., He-surface distances Z>2 Å, the corrugation unexpectedly increases up to an impressive ≳85%. This is not due to van der Waals interactions but to the combination of soft potential effects and the evolution of He-cation and He-anion interactions with Z. This feature, not previously analyzed on alkali-halide surfaces, may favor the alignment properties of weakly interacting overlayers.
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Affiliation(s)
- G A Bocan
- Instituto de Nanociencia y Nanotecnología, Nodo Bariloche (CONICET-CNEA) and Instituto Balseiro (U. N. Cuyo), Centro Atómico Bariloche, Avenida Bustillo 9500, 8400 San Carlos de Bariloche, Argentina
| | - H Breiss
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405 Orsay, France
| | - S Szilasi
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405 Orsay, France
| | - A Momeni
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405 Orsay, France
- CY Cergy Paris Université, F-95000 Cergy, France
| | - E M Staicu Casagrande
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405 Orsay, France
| | - M S Gravielle
- Instituto de Astronomía y Física del Espacio (UBA-CONICET), Casilla de Correo 67, Sucursal 28, C1428EGA Buenos Aires, Argentina
| | - E A Sánchez
- Instituto de Nanociencia y Nanotecnología, Nodo Bariloche (CONICET-CNEA) and Instituto Balseiro (U. N. Cuyo), Centro Atómico Bariloche, Avenida Bustillo 9500, 8400 San Carlos de Bariloche, Argentina
| | - H Khemliche
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405 Orsay, France
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