Kikuchi patterns of Mo{100} and primary electron localization

Gomoyunova, M. V.; Pronin, I. I.; Shmulevitch, I.A.

doi:10.1016/0039-6028(84)90062-1

Cited by 18 publications

(5 citation statements)

References 12 publications

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“…In this paper, we start by investigating the same phenomenon with a different source of electrons: inelastically scattered electrons of similar energies, which can be called Kikuchi electrons to reflect the importance of s~ubsequent to their energy loss [9]. Several other authors [10], [11], [12], [13] have also investigated Kikuchi electrons. Gomoyunova et al [10] correctly interpreted angular Kikuchi electron distributions for Mo(100) in terms of peaks due to electrons emitted preferentially along atomic chains, but…”

Section: Introductionmentioning

confidence: 99%

“…Several other authors [10], [11], [12], [13] have also investigated Kikuchi electrons. Gomoyunova et al [10] correctly interpreted angular Kikuchi electron distributions for Mo(100) in terms of peaks due to electrons emitted preferentially along atomic chains, but…”

Section: Introductionmentioning

confidence: 99%

“…Our multiple-scattering theory uses the formalism called "near-field expansion 10 clusters", described elsewhere [16]. It is specifically designed to describe forward focusing accurately and efficiently, despite the relatively high electron energies.…”

Section: Introductionmentioning

confidence: 99%

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Forward focusing of Auger and Kikuchi electrons for surface structure determination: Ni(100) and oxidized Mg(0001)

et al. 1989

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Angular profiles of "Kikuchi" and Auger electrons were measured and interpreted for a clean Ni(100) surface and a slightly oxidized Mg(OOOI) surface. Theoretical analysis of the data using forward focusing of the medium-energy electrons (500-1500 e V) shows that both Kikuchi and Auger electrons can be well represented as s-waves emitted from atomic sites. The Auger electron data are used to analyze the structure of slightly oxidized Mg(OOOI), yielding oxygen atom positions in the octahedral interstitial sites in the first two interlayer spacings of the metal.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Forward focusing of Auger and Kikuchi electrons for surface structure determination: Ni(100) and oxidized Mg(0001)

et al. 1989

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“…As the energy is increased, the intensities of these beams first pass a succession of maxima and minima and then gradually fade away. When the diffracted beams disappear, several experiments have shown that the electrons are reflected in all directions with broad intensity maxima at directions that can be associated with crystal chains of atoms [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] . Because of this drastic change in the angular pattern, a LEED experiment extended into this energy region is often referred to as medium-energy electron diffraction ͑MEED͒.…”

Section: Introductionmentioning

confidence: 99%

Diffraction effects in the incident and exit paths of electrons backscattered from Cu(001) at medium energies

et al. 1999

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We analyze experimentally and theoretically the angular distribution of electrons backscattered from Cu͑001͒ at medium energies. We present polar intensity plots ͑PIP's͒ of backscattered electrons with important qualitative differences with PIP's of x-ray photoemitted electrons acquired in similar conditions. In particular, our PIP's of backscattered electrons present peaks, ascribed to diffraction effects in the incident part of the electron trajectory, and a symmetry that are not observed in the PIP's of photoelectrons. The theoretical analysis has been made using a model presented recently to explain the change of the angular pattern in passing from low to medium energies. We present calculations performed including curved-wave-front and multiplescattering effects that are in very good agreement with the experiments. The results show that the main structures in the PIP's are produced by forward-focusing interferences ͑similar to those of photoelectron diffraction͒ in either the incoming or the outgoing parts of the electron trajectory, and by interferences between waves with important forward scattering in both the incoming and outgoing parts of the electron trajectory.

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“…Very surprisingly, when the diffracted beams disappear the angular pattern becomes similar to those measured in XPD and AED experiments. [5][6][7][8][9][10][11][12][13][14][15][16] Because of this new characteristic, a LEED experiment extended into this energy region is often referred to as medium-energy electron diffraction ͑MEED͒. The high counting rates in MEED and the direct relation of the structures in the angular pattern with the real lattice have been exploited in different crystallographic studies.…”

Section: Introductionmentioning

confidence: 99%

Angular distribution of backscattered electrons with excitation of phonons and plasmons

Alvarez

Zampieri

1998

Phys. Rev. B

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The ''elastic'' backscattering of electrons from crystalline surfaces has two regimes: at low energies the angular distribution has the narrow peaks characteristic of the Bragg diffraction, but at medium energies the angular distribution changes and becomes similar to that observed in Auger and x-ray photoelectron diffraction. We have presented recently a model that explains this change of the angular distribution in terms of the excitation/absorption of phonons during the scattering. In this paper we apply the model to the case of the electron backscattering from Al͑111͒, finding good agreement between calculated and measured angular distributions. In addition to this, we present a decomposition of the calculated intensity into the contributions of the scattering events with excitation and/or absorption of n phonons (0рnр8), and we compare these contributions with the angular distributions of electrons reflected having excited n plasmons (0рnр8). All these results are used to elucidate the nature of the change of the angular pattern in passing from low to medium energies.

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Kikuchi patterns of Mo{100} and primary electron localization

Cited by 18 publications

References 12 publications

Forward focusing of Auger and Kikuchi electrons for surface structure determination: Ni(100) and oxidized Mg(0001)

Forward focusing of Auger and Kikuchi electrons for surface structure determination: Ni(100) and oxidized Mg(0001)

Diffraction effects in the incident and exit paths of electrons backscattered from Cu(001) at medium energies

Angular distribution of backscattered electrons with excitation of phonons and plasmons

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