Coherence during Scattering of Fast H Atoms from a LiF(001) Surface

Lienemann, J.; Schüller, A.; Blauth, D.; Seifert, J.; Wethekam, S.; Busch, M.; Maass, K.; Winter, H.

doi:10.1103/physrevlett.106.067602

Cited by 36 publications

(36 citation statements)

References 27 publications

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“…The first experimental evidences of this phenomenon were reported at insulator materials [1,2], where the presence of a wide band gap helps to suppress inelastic processes, thus preventing quantum decoherence [12]. Soon afterwards the effect was observed at semiconductor [13] and metallic surfaces [7,14], even though in the last case, energy-loss values were found to be significant [7,15,16].…”

Section: Introductionmentioning

confidence: 98%

Energy-loss contribution to grazing scattering of fast He atoms from a silver surface

et al. 2014

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The energy lost by helium atoms axially scattered from a Ag(110) surface is studied in order to investigate the influence of dissipative processes on fast atom diffraction spectra. In this work inelastic projectile distributions are evaluated within a semiclassical formalism that includes dissipative effects due to electron-hole excitations through a friction force. For incidence along the [112] and [110] directions the model predicts the presence of multiple peaks in the energy-loss spectrum for a given impact energy. But these structures are completely washed out when the experimental dispersion of the incident beam is taken into account, giving rise to a smooth energy-loss distribution. Simulations including the experimental energy spread are in fairly good agreement with available experimental data for the [112] channel. In addition, our results suggest that inelastic processes produce an almost constant background in the transverse momentum distribution, except in the extremes of the momentum range where classical rainbow maxima appear. By adding elastic and inelastic contributions, experimental diffraction patterns are well reproduced.

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Section: Introductionmentioning

confidence: 98%

Energy-loss contribution to grazing scattering of fast He atoms from a silver surface

et al. 2014

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“…Therefore, modifications of the surface can be neglected [13,14]. Among these techniques, especially fast atom diffraction (FAD) [11,[15][16][17][18][19][20][21][22] with de Broglie wavelengths of some 0.001Å gained considerable interest and motivated numerous studies with respect to FADs phenomenological description [23][24][25][26][27][28][29][30][31][32][33][34][35][36] and utilization for epitaxial growth monitoring [37,38] as well as qualitative and quantitative structure determination [19][20][21]33,[39][40][41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Quantitative structure determination using grazing scattering of fast atoms: Oxygen-induced missing-row reconstruction of Mo(112)

Seifert

Winter

2016

Phys. Rev. B

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We present an extensive study on the structure of oxygen adsorbates on Mo(112) by means of grazing scattering of fast hydrogen and helium atoms and low-energy electron diffraction. For projectile energies less than 2 keV, fast atom diffraction provides information on the surface unit cell and on adsorption sites for low coverages. In the classical scattering regime, we employed so-called triangulation techniques where for an azimuthal rotation of the target axial surface channels are identified. From comparison with computer simulation positions of surface atoms can be derived. Aside from the detection scheme of projectile-induced electron emission, we present details for a new variant of triangulation based on the detection of angular distributions of scattered particles. The different sensitivity of the methods to the topmost surface layers allows us to efficiently set up structural models for four adsorbate phases for which contradicting models exist in literature. The c(4×2) phase is revealed to be one step in the formation of a missing-row reconstruction with p(1×2) unit cell. Our studies demonstrate the potential of grazing scattering of fast atoms for quantitative structure analysis.

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“…The observation of quantum interference effects for fast atoms impinging on crystal surfaces strongly relies on the preservation of quantum coherence [14][15][16] and in this regard, the coherence conditions of the incident beam play an important role. Motivated by Ref.…”

Section: Introductionmentioning

confidence: 99%

Influence of beam collimation on fast-atom diffraction studied via a semiquantum approach

Gravielle

Miraglia

2015

Phys. Rev. A

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The influence of the collimating conditions of the incident beam on diffraction patterns produced by grazing scattering of fast atoms off crystal surfaces is studied within a semi-quantum approach, named Surface Initial Value Representation (SIVR) approximation. In this approach we incorporate a realistic description of the incident particle in terms of the collimating parameters, which determine the surface area that is coherently illuminated. The model is applied to He atoms colliding with a LiF(001) surface after passing through a rectangular aperture. As it was experimentally observed [1], SIVR spectra as a function of the azimuthal angle are very sensitive to the width of the collimating slit. We also found that the length of the collimating aperture affects polar angle distributions, introducing additional interference structures for the longer collimating slits.

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Coherence during Scattering of Fast H Atoms from a LiF(001) Surface

Cited by 36 publications

References 27 publications

Energy-loss contribution to grazing scattering of fast He atoms from a silver surface

Energy-loss contribution to grazing scattering of fast He atoms from a silver surface

Quantitative structure determination using grazing scattering of fast atoms: Oxygen-induced missing-row reconstruction of Mo(112)

Influence of beam collimation on fast-atom diffraction studied via a semiquantum approach

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