Zobrazeno 1 - 10
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pro vyhledávání: '"Roncin, Philippe"'
Autor:
Rousseau, Patrick, Roncin, Philippe
Grazing incidence fast atom diffraction (GIFAD or FAD) has become a technique to track the surface topology of crystal surface at the atomic scale. The paper retraces the events that led to the discovery of unexpected quantum behavior of keV atoms du
Externí odkaz:
http://arxiv.org/abs/2407.09554
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
Externí odkaz:
http://arxiv.org/abs/2310.14619
Publikováno v:
Physical Chemistry Chemical Physics, 2022, vol. 24, no 20, p. 12319-12328
Grazing incidence fast atom diffraction at crystal surfaces (GIFAD or FAD) has demonstrated coherent diffraction both at effective energies close to one eV ($\lambda_\perp\approx$ 14 pm for He) and at elevated surface temperatures offering high topol
Externí odkaz:
http://arxiv.org/abs/2210.06555
Publikováno v:
Rev. Sci. Instrum. 93, 093305 (2022)
We describe a UHV setup for grazing incidence fast atom diffraction (GIFAD) experiments. The overall geometry is simply a source of keV atoms facing an imaging detector. Therefore, It is very similar to the geometry of RHEED experiments, reflection h
Externí odkaz:
http://arxiv.org/abs/2205.08139
Autor:
Roncin, Philippe
Publikováno v:
J. Phys. B: At. Mol. Opt. Phys. 53 (2020) 202001
Michel Barat passed away in November 2018 at the age of 80 after a rich career in atomic and molecular collisions. He had participated actively in formalizing to the electron promotion model, contributed to low energy reactive collisions at the front
Externí odkaz:
http://arxiv.org/abs/2005.07491
Publikováno v:
J. Phys. Chem. Lett. 2020, 11
Ne atoms with energies up to 3 keV are diffracted under grazing angles of incidence from a LiF(001) surface. For a small momentum component of the incident beam perpendicular to the surface, we observe an increase of the elastic rainbow angle togethe
Externí odkaz:
http://arxiv.org/abs/2005.06865
Autor:
Cartry, Gilles, Kogut, Dmitry, Achkasov, Kostiantyn, Layet, Jean-Marc, Farley, Thomas, Gicquel, Alix, Achard, Jocelyn, Brinza, Ovidiu, Bieber, Thomas, Khemliche, Hocine, Roncin, Philippe, Simonin, Alain
Publikováno v:
New Journal of Physics, Institute of Physics: Open Access Journals, 2017, 19 (2), pp.025010
This paper deals with a study of H-/D-negative ion surface production on diamond in low pressure H2/D2 plasmas. A sample placed in the plasma is negatively biased with respect to plasma potential. Upon positive ion impacts on the sample, some negativ
Externí odkaz:
http://arxiv.org/abs/1910.05158
Autor:
Roncin, Philippe, Debiossac, Maxime
To describe the grazing scattering of keV atoms at surface, a new quantum binary collision model have been proposed where the dynamical properties of the surface atoms are considered via the wave-function of the local Debye harmonic oscillator. This
Externí odkaz:
http://arxiv.org/abs/1807.08967
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B Volume 427, 15 July 2018
The diffraction of fast atoms at grazing incidence on crystal surfaces (GIFAD) was first interpreted only in terms of elastic diffraction from a perfectly periodic rigid surface with atoms fixed at equilibrium position. Recently, a new approach have
Externí odkaz:
http://arxiv.org/abs/1710.08980
We describe a high resolution imaging detector based on a single 80 mm micro-channel-plate (MCP) and a phosphor screen mounted on a UHV flange of only 100 mm inner diameter. It relies on standard components and we describe its performance with one or
Externí odkaz:
http://arxiv.org/abs/1710.01243