Selective adsorption resonances: Quantum and stochastic approaches

Sanz, Ángel S.; Miret‐Artés, Salvador

doi:10.1016/j.physrep.2007.08.001

Cited by 73 publications

(84 citation statements)

References 383 publications

(668 reference statements)

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“…Calculated BSRs, such as the strong minima (diagonal, blue features), are much narrower than any of the features observed in the experiment ( figure 2). Narrow resonances are associated with states having a long lifetime [3] and we conclude that the lifetime of states in the experiment is significantly shorter than the natural lifetime of those supported by the existing potential. In order to reconcile the experiment with the calculation, we have considered the various factors that affect and limit the lifetime of resonant states.…”

Section: Scattering Calculationsmentioning

confidence: 70%

“…However, a corrugated well may have a greater effect on the resonance lifetimes. We use a corrugated Morse potential [3,25] as it provides the correct attributes for corrugating the attractive part of the well, combined with a convenient functional form. The specular intensity for scattering from the reference potential is compared with that from the Morse potential in figure 7.…”

Section: Scattering Calculationsmentioning

confidence: 99%

“…The enhancement to the linewidth, evident in figure 7, can be considered quantitatively using the mixed S-matrix method [3,26,27]. For an isolated resonance, the imaginary part of the resonance profile as a function of the dynamical variable, α, is related to scattering matrix by whereᾱ and Γ are the resonance position and width respectively.…”

Section: Scattering Calculationsmentioning

confidence: 99%

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Linewidths in bound state resonances for helium scattering from Si(111)–(1 × 1)H

Tuddenham

Hedgeland

Knowling

et al. 2009

J. Phys.: Condens. Matter

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Abstract. Helium-3 spin-echo measurements of resonant scattering from the Si(111)-(1x1)H surface, in the energy range 4 − 14 meV, are presented. The measurements have high energy resolution yet they reveal bound state resonance (BSR) features with uniformly broad linewidths. We show that exact quantum mechanical calculations of the elastic scattering, using the existing potential for the Helium/Si(111)-(1x1)H interaction, cannot reproduce the linewidths seen in the experiment. Further calculations rule out inelastic and other mechanisms that might give rise to losses from the elastic scattering channels. We show that corrugation in the attractive part of the atom-surface potential is the most likely origin of the experimental lineshapes.

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Section: Scattering Calculationsmentioning

confidence: 70%

Section: Scattering Calculationsmentioning

confidence: 99%

Section: Scattering Calculationsmentioning

confidence: 99%

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Linewidths in bound state resonances for helium scattering from Si(111)–(1 × 1)H

Tuddenham

Hedgeland

Knowling

et al. 2009

J. Phys.: Condens. Matter

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“…The use of atomic scattering as a probe of surface structure and dynamics has a long history [18] but, because of the strong coupling in the scattering event, implementation of quantitative theoretical analysis of the intensities in elastic and inelastic channels remains a formidable problem [3,19]. The strong coupling is manifested in the relatively small fraction of the scattering that is in elastic channels and in symmetry-breaking effects such as the excitation of shear horizontal (SH) phonons for scattering near high-symmetry directions of a monolayer solid [5].…”

Section: Helium Scattering By Inert Gas Monolayersmentioning

confidence: 99%

Unified quantum theory of elastic and inelastic atomic scattering from a physisorbed monolayer solid

Bruch

Hansen

Dammann³

2017

Phys. Rev. B

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. Unified quantum theory of elastic and inelastic atomic scattering from a physisorbed monolayer solid. Physical Review B, 95(21), [214303]. DOI: 10.1103/PhysRevB.95.214303 PHYSICAL REVIEW B 95, 214303 (2017 Unified quantum theory of elastic and inelastic atomic scattering from a physisorbed monolayer solid A unified quantum theory of the elastic and inelastic scattering of low energy He atoms by a physisorbed monolayer solid in the one-phonon approximation is given. It uses a time-dependent wave packet with phonon creation and annihilation components and has a self-consistent feedback between the wave functions for elastic and inelastic scattered atoms. An attenuation of diffraction scattering by inelastic processes thus is inherent in the theory. The atomic motion and monolayer vibrations in the harmonic approximation are treated quantum mechanically and unitarity is preserved. The evaluation of specific one-phonon events includes contributions from diffuse inelastic scattering in other phonon modes. Effects of thermally excited phonons are included using a mean field approximation. The theory is applied to an incommensurate Xe/Pt(111) monolayer (incident energy E i = 4-16 meV), a commensurate Xe/graphite monolayer (E i 64 meV), and an incommensurate Xe/Cu(001) monolayer (E i 8 meV). The monolayers are very corrugated targets and there are transient closed diffraction and inelastic channels in the calculations. In many cases, the energy gain events have strengths comparable to the energy loss events.

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“…6 In the free-atom approximation, the closed channels correspond to bound states of the laterally averaged potential and have a plane-wave character parallel to the surface. The kinematically allowed G-vectors for scattering, i.e., those which produce real diffracted beams, are those for which k f,z 2 is positive.…”

Section: Introductionmentioning

confidence: 99%

Analysis and refinement of the Cu(001)c(2×2)CO–He potential using He3 selective adsorption resonances

Riley

Jardine

Alexandrowicz

et al. 2008

The Journal of Chemical Physics

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Measurements of (3)He scattering from the Cu(001)c(2 x 2)CO surface using (3)He spin-echo spectroscopy show a number of selective adsorption resonance features. The features cannot be reproduced by close coupled scattering calculations based on the existing Cu(001)c(2 x 2)CO-He interaction potential. An empirical potential is created by adjusting the shape, depth, and width of the existing potential to improve agreement with the experimental data.

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Selective adsorption resonances: Quantum and stochastic approaches

Cited by 73 publications

References 383 publications

Linewidths in bound state resonances for helium scattering from Si(111)–(1 × 1)H

Linewidths in bound state resonances for helium scattering from Si(111)–(1 × 1)H

Unified quantum theory of elastic and inelastic atomic scattering from a physisorbed monolayer solid

Analysis and refinement of the Cu(001)c(2×2)CO–He potential using He3 selective adsorption resonances

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