Ordinary and supernumerary resonant scattering of low energy electrons from the BiCu2(111) surface alloy

Bene Poelsema, Michael S. Altman, Raoul van Gastel, Harold J.W. Zandvliet, Arie van Houselt

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Abstract

Electron intensity versus energy curves from the ordered substitutional BiCu2(111)-surface alloy, obtained with low energy electron microscopy (LEEM), show distinct unexpected intensity dips under normal incidence conditions. The dips above 10 eV are found to be characteristic of ordinary resonant scattering of electrons. Their positions represent resonant scattering into image potential states, involving scattering along G 10 and G 11 reciprocal lattice vectors. A detailed analysis of additional specular intensity dips at energies below 10 eV demonstrates that these originate from supernumerary resonant scattering, now also along lower symmetry directions, that should be forbidden in this energy range for the perfect crystal. LEEM is highly sensitive to detect these often neglected features which, if not properly disentangled or discarded, hamper its potential to extract the rich information about atomic positions and unoccupied electronic states encoded in very low energy electron scattering.
Original languageEnglish
Article number013024
JournalNew journal of physics
Volume19
DOIs
Publication statusPublished - 2017

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electron energy
scattering
energy
electron microscopy
electron flux density
electron scattering
incidence
symmetry
curves
electronics
crystals
electrons

Keywords

  • METIS-322059
  • IR-104629

Cite this

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title = "Ordinary and supernumerary resonant scattering of low energy electrons from the BiCu2(111) surface alloy",
abstract = "Electron intensity versus energy curves from the ordered substitutional BiCu2(111)-surface alloy, obtained with low energy electron microscopy (LEEM), show distinct unexpected intensity dips under normal incidence conditions. The dips above 10 eV are found to be characteristic of ordinary resonant scattering of electrons. Their positions represent resonant scattering into image potential states, involving scattering along G 10 and G 11 reciprocal lattice vectors. A detailed analysis of additional specular intensity dips at energies below 10 eV demonstrates that these originate from supernumerary resonant scattering, now also along lower symmetry directions, that should be forbidden in this energy range for the perfect crystal. LEEM is highly sensitive to detect these often neglected features which, if not properly disentangled or discarded, hamper its potential to extract the rich information about atomic positions and unoccupied electronic states encoded in very low energy electron scattering.",
keywords = "METIS-322059, IR-104629",
author = "Bene Poelsema and Altman, {Michael S.} and {van Gastel}, Raoul and Zandvliet, {Harold J.W.} and {van Houselt}, Arie",
year = "2017",
doi = "10.1088/1367-2630/aa55ab",
language = "English",
volume = "19",
journal = "New journal of physics",
issn = "1367-2630",
publisher = "IOP Publishing Ltd.",

}

Ordinary and supernumerary resonant scattering of low energy electrons from the BiCu2(111) surface alloy. / Poelsema, Bene; Altman, Michael S.; van Gastel, Raoul; Zandvliet, Harold J.W.; van Houselt, Arie.

In: New journal of physics, Vol. 19, 013024, 2017.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Ordinary and supernumerary resonant scattering of low energy electrons from the BiCu2(111) surface alloy

AU - Poelsema, Bene

AU - Altman, Michael S.

AU - van Gastel, Raoul

AU - Zandvliet, Harold J.W.

AU - van Houselt, Arie

PY - 2017

Y1 - 2017

N2 - Electron intensity versus energy curves from the ordered substitutional BiCu2(111)-surface alloy, obtained with low energy electron microscopy (LEEM), show distinct unexpected intensity dips under normal incidence conditions. The dips above 10 eV are found to be characteristic of ordinary resonant scattering of electrons. Their positions represent resonant scattering into image potential states, involving scattering along G 10 and G 11 reciprocal lattice vectors. A detailed analysis of additional specular intensity dips at energies below 10 eV demonstrates that these originate from supernumerary resonant scattering, now also along lower symmetry directions, that should be forbidden in this energy range for the perfect crystal. LEEM is highly sensitive to detect these often neglected features which, if not properly disentangled or discarded, hamper its potential to extract the rich information about atomic positions and unoccupied electronic states encoded in very low energy electron scattering.

AB - Electron intensity versus energy curves from the ordered substitutional BiCu2(111)-surface alloy, obtained with low energy electron microscopy (LEEM), show distinct unexpected intensity dips under normal incidence conditions. The dips above 10 eV are found to be characteristic of ordinary resonant scattering of electrons. Their positions represent resonant scattering into image potential states, involving scattering along G 10 and G 11 reciprocal lattice vectors. A detailed analysis of additional specular intensity dips at energies below 10 eV demonstrates that these originate from supernumerary resonant scattering, now also along lower symmetry directions, that should be forbidden in this energy range for the perfect crystal. LEEM is highly sensitive to detect these often neglected features which, if not properly disentangled or discarded, hamper its potential to extract the rich information about atomic positions and unoccupied electronic states encoded in very low energy electron scattering.

KW - METIS-322059

KW - IR-104629

U2 - 10.1088/1367-2630/aa55ab

DO - 10.1088/1367-2630/aa55ab

M3 - Article

VL - 19

JO - New journal of physics

JF - New journal of physics

SN - 1367-2630

M1 - 013024

ER -