Zone edge focused two-phonon processes in He atom scattering from a simple prototype system: Xe(111). Šiber, A. & Gumhalter, B. Surface Science, 502-503:422-428, 4, 2002.
Zone edge focused two-phonon processes in He atom scattering from a simple prototype system: Xe(111) [link]Website  abstract   bibtex   
We present a theoretical analysis of the multiphonon features appearing in the angular and energy resolved scattering spectra of low-energy He atoms inelastically scattered from surface phonons. By applying the recently developed fully quantum multiphonon scattering formalism to the benchmark system Xe(1 1 1) we are able to reproduce with great accuracy the experimental data and also demonstrate how in the transition from a single- to a few- to a multiphonon scattering regime the one- and the many-phonon components of the scattering spectra evolve as the mean number of exchanged phonons increases with the increase of He atom incident energy. We show how the two-phonon processes may give rise to distinct peaks in the scattering spectrum as a result of the zone edge focusing effects and how the many-phonon features may still produce a structured background before the true multiphonon limit characterised by a Gaussian spectral shape is reached. These findings should prove useful in the interpretation of multiphonon He atom scattering spectra from other systems with similar surface vibrational properties. © 2002 Elsevier Science B.V. All rights reserved.
@article{
 title = {Zone edge focused two-phonon processes in He atom scattering from a simple prototype system: Xe(111)},
 type = {article},
 year = {2002},
 identifiers = {[object Object]},
 keywords = {Atom-solid interactions,Energy dissipation,Low index single crystal surfaces,Phonons,diffraction,scattering},
 pages = {422-428},
 volume = {502-503},
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 month = {4},
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 abstract = {We present a theoretical analysis of the multiphonon features appearing in the angular and energy resolved scattering spectra of low-energy He atoms inelastically scattered from surface phonons. By applying the recently developed fully quantum multiphonon scattering formalism to the benchmark system Xe(1 1 1) we are able to reproduce with great accuracy the experimental data and also demonstrate how in the transition from a single- to a few- to a multiphonon scattering regime the one- and the many-phonon components of the scattering spectra evolve as the mean number of exchanged phonons increases with the increase of He atom incident energy. We show how the two-phonon processes may give rise to distinct peaks in the scattering spectrum as a result of the zone edge focusing effects and how the many-phonon features may still produce a structured background before the true multiphonon limit characterised by a Gaussian spectral shape is reached. These findings should prove useful in the interpretation of multiphonon He atom scattering spectra from other systems with similar surface vibrational properties. © 2002 Elsevier Science B.V. All rights reserved.},
 bibtype = {article},
 author = {Šiber, Antonio and Gumhalter, Branko},
 journal = {Surface Science}
}

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