Ar scattering on Ru (0001): a comparison to the washboard modelPresented at the Stereodynamics 2000 Conference on Dynamics and Stereodynamics of Chemical Reactions, El Escorial, Madrid, December 1–5, 2000.

Berenbak, B.; Zboray, S.; Riedmüller, B; Papageorgopoulos, Dimitrios; Stolte, S.; Kleyn, Aart W.

doi:10.1039/b105514n

Cited by 37 publications

(44 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These include Xe-Ni͑111͒, 3 Xe-Pt͑111͒, 4,5 Xe-GaAs͑100͒, 6 Xe-Ag͑100͒, 6 Xe-Ge͑100͒, 6 Ar-Pt͑111͒, 5 Ar-Ag͑111͒, 7 and Ar-Ru͑0001͒. 8 For incident energies greater than about 1 eV, the angular distribution of the scattered flux is concentrated in one peak whose intensity maximum is at the specular or larger angle. In general, this distribution is fairly narrow, at least for the lowest surface temperatures, with a fullwidth half-maximum ͑FWHM͒ of ϳ10°-20°.…”

Section: Introductionmentioning

confidence: 98%

Hyperthermal Ar atom scattering from a C(0001) surface

Gibson

Sibener

Upadhyaya

et al. 2008

The Journal of Chemical Physics

View full text Add to dashboard Cite

Experiments and simulations on the scattering of hyperthermal Ar from a C(0001) surface have been conducted. Measurements of the energy and angular distributions of the scattered Ar flux were made over a range of incident angles, incident energies (2.8-14.1 eV), and surface temperatures (150-700 K). In all cases, the scattering is concentrated in a narrow superspecular peak, with significant energy exchange with the surface. The simulations closely reproduce the experimental observations. Unlike recent experiments on hyperthermal Xe scattering from graphite [Watanabe et al., Eur. Phys. J. D 38, 103 (2006)], the angular dependence of the energy loss is not approximated by the hard cubes model. The simulations are used to investigate why parallel momentum conservation describes Xe scattering, but not Ar scattering, from the surface of graphite. These studies extend our knowledge of gas-surface collisional energy transfer in the hyperthermal regime, and also demonstrate the importance of performing realistic numerical simulations for modeling such encounters.

show abstract

Section: Introductionmentioning

confidence: 98%

Hyperthermal Ar atom scattering from a C(0001) surface

Gibson

Sibener

Upadhyaya

et al. 2008

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…However, diffraction is usually strong only for thermal energy helium, due to its small mass. Inelastic scattering tends to dominate for heavier probe atoms unless particular experimental conditions, such as low surface temperatures or grazing incidence reflection, are adopted [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Unexpectedly, early neon atom scattering measurements also revealed diffraction peaks [1,2], even though the ordinary Debye-Waller theory predicted them to be unobservably weak.…”

Section: Introductionmentioning

confidence: 99%

“…First, it must be recalled that (13) is only a classical, or high-temperature, approximation to the quantum expression for B(τ ) given by (12). The latter contains a complex factor exp(iωτ ) in the zero-point term.…”

Section: Scattering From An Einstein Modelmentioning

confidence: 99%

Quantum scattering of neon from a nanotextured surface

Levi

Huang

Allison

et al. 2009

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Abstract. Phonon exchange is the usual cause of decoherence in atom-surface scattering. By including quantum effects in the treatment of Debye-Waller scattering, we show that phonon exchange becomes ineffective when the relevant phonon frequencies are high. The result explains the surprising observation of strong elastic scattering of Ne from a Cu(100) surface nanotextured with a c(2 × 2) Li adsorbate structure. We extend a previous model to describe the phonon spectra by an Einstein oscillator component with an admixture of a Debye spectrum. The Einstein oscillator represents the dominant, high frequency vibration of the adsorbate, normal to the surface, while the Debye spectrum represents the substrate contribution. Neon scattering is so slow that exciting the adsorbate mode has a low probability and is impossible if the incident energy is below the threshold. Thus, adsorbate vibrations are averaged out. A theoretical discussion and calculation shows that under such circumstances the vibrations of a light adsorbate do not contribute to the Debye-Waller effect, with the result that Ne scattering at thermal energies is quantum-mechanical and largely elastic, explaining the high reflectivity and the diffraction peaks observed experimentally.

show abstract

“…Previous studies of rare-gas and diatomic molecular scattering from clean Ru(0001) have revealed a large effective mass. An analysis of the energy-resolved spectra of Ar scattering from Ru(0001) [42,43] as well as scattering of N 2 molecules from similar Ru(0001) [44,45] gave for both projectile particles an effective mass of approximately 2.5 Ru atoms. Based on the analysis of those two systems it was proposed that the Ru(0001) surface would present a large effective mass for the scattering of all the rare gases and even for other projectiles [46].…”

Section: Surface Effective Masses From Ar Scatteringmentioning

confidence: 99%

Probing interlayer interactions between graphene and metal substrates by supersonic rare-gas atom scattering

et al. 2015

View full text Add to dashboard Cite

We demonstrate that highly surface-sensitive supersonic rare-gas (He, Ar, and Xe) atom scattering, in both the quantum and classical regimes, can probe and quantify the interlayer interactions between graphene monolayers and metal substrates in terms of the Debye temperature corresponding to the surface normal vibration, and the surface effective mass. As models of the strongly and weakly interacting graphene, we investigated two systems, graphene on Ru(0001) and Pt (111), respectively. The experimental data for Ar and Xe are compared with the results from theoretical simulations based on the classical smooth surface model. For gr/Pt(111) we find that the scattering pattern of the rare-gas beam, including the Debye-Waller attenuation of the He beam, are quite similar to that from highly oriented pyrolytic graphite (HOPG); this suggests that the graphene-Pt (111) interaction is much like a van der Waals interaction. On the contrary, for the gr/Ru(0001) system, we find a smaller Debye-Waller attenuation and a larger surface effective mass, indicating that graphene on Ru(0001) is tightly bonded to the substrate. Furthermore, asymmetrical spectral shapes in the Ar and Xe scattering spectra from gr/Ru(0001) are interpreted as a result of the lateral distribution of the interlayer interaction corresponding to the moiré pattern. It is found that the "valley" region of the moiré pattern has high effective mass reflecting stronger bonding to the substrate, contributing to the high reflectivity of the He beam reported for this system. On the other hand, the effective mass of the "hill" region is found to be similar to that of HOPG, indicating that this region is well decoupled from the substrate. These results demonstrate a unique capability of atom scattering to probe and evaluate the molecule-substrate interaction and its spatial distributions.

show abstract

Ar scattering on Ru (0001): a comparison to the washboard modelPresented at the Stereodynamics 2000 Conference on Dynamics and Stereodynamics of Chemical Reactions, El Escorial, Madrid, December 1–5, 2000.

Cited by 37 publications

References 9 publications

Hyperthermal Ar atom scattering from a C(0001) surface

Hyperthermal Ar atom scattering from a C(0001) surface

Quantum scattering of neon from a nanotextured surface

Probing interlayer interactions between graphene and metal substrates by supersonic rare-gas atom scattering

Contact Info

Product

Resources

About