Computer simulation of the reflection of energetic ions from crystal surfaces at glancing incidence

Danailov, Daniel M.; Gärtner, K.; Caro, A.

doi:10.1016/s0168-583x(98)00996-3

Cited by 23 publications

(10 citation statements)

References 21 publications

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“…Intuitively, there is a reasonable hope that the actual constraint is that the corrugation function integrates to zero over a lattice unit, i.e., for symmetric cells. Another very useful extension would be to link directly this model to the 2D row model developed for grazing incidences [33], where the corrugation amplitude may depend on the effective energy. Concerning the limitations, these should the same as exposed in [5] knowing that the intensities are supposed to be better described than the associated phases.…”

Section: Resultsmentioning

confidence: 99%

Atomic diffraction under oblique incidence: An analytical expression

Debiossac

Roncin

2014

Phys. Rev. A

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The semiclassical perturbation method developed by Henkel et al. [J. Phys. II 4, 1955(1994] to model cold-atom diffraction by optical standing waves, is applied to the diffraction of fast atoms on crystal surfaces at grazing incidence (GIFAD or FAD). We first show that the interaction time and interaction length embedded in the obliquity factor is well suited to explain the transition from three-dimensional to two-dimensional (2D) diffraction. The situation of a slightly misaligned primary beam, corresponding to oblique incidence in the effective 2D system, is addressed pointing out discrepancies such as the absence of net deflection of the atomic beam. Guided by time-reversal considerations, we propose an arbitrarily symmetrized form significantly improving the agreement with experimental data recorded in oblique incidence.

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Section: Resultsmentioning

confidence: 99%

Atomic diffraction under oblique incidence: An analytical expression

Debiossac

Roncin

2014

Phys. Rev. A

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“…It was rapidly noticed that the fast motion along x and the slow motion, in the (y,z) plane, appear decoupled. In the slow motion plane, the situation is similar to that of a hyper-thermal helium atom, with energy E ⊥ , interacting with a 1D array of quasi-atoms [15]. The fast projectiles are sensitive to the potential averaged along the axial channel, so that only the surface corrugation across the channel is resolved.…”

Section: Gifadmentioning

confidence: 99%

Helium diffraction on SiC grown graphene: Qualitative and quantitative descriptions with the hard-corrugated-wall model

Debiossac

Zugarramurdi

et al. 2016

Phys. Rev. B

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Monolayer epitaxial graphene grown on 6H-SiC(0001), was recently investigated by grazing incidence fast atom diffraction and analyzed with ab initio electronic density calculation and with exact atomic diffraction methods. With these results as a reference, the hard corrugated wall model (HCW) is used as a complementary analytic approach to link binary potentials to the observed atomic corrugation. The main result is that the HCW model reproduces the macroscopic corrugation of the Moiré pattern on a quantitative level suggesting that softwall corrections may be neglected for macroscopic superstructures allowing straightforward analysis in terms of a 1D corrugation function.

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“…The angle of the two peaks shown in the right panel with respect to the plane of beam axis and surface normal corresponds to the rainbow angle H rb of the related simulated trajectories in the left panel. Different potentials show different corrugated equipotential planes resulting in different rainbow angles at the same normal energy E z [12]. This allows one to derive the effective scattering potential [9].…”

Section: Methodsmentioning

confidence: 99%

“…In the regime of surface channeling, the scattering potential results from averaged continuum potentials with 'planar' or 'axial' symmetry [7]. In recent work [9] we have demonstrated that detailed information on the effective pair potentials at metal surfaces can be derived from ''rainbow'' structures [10] observed in the angular distributions after scattering of fast atoms along axial strings in the surface plane of mono-crystalline samples [9,11,12]. ''Rainbow-scattering'' results from a maximum in the deflection function [10,13,14] for scattering from the strings of surface atoms described by a continuum potential with cylindrical symmetry.…”

Section: Introductionmentioning

confidence: 99%