Determining the optical properties of adsorbate covered surfaces by dichroism in VUV-photoemission

Oelsner, A.; Fecher, Gerhard H.; Schicketanz, M.; Schönhense, G.

doi:10.1016/s0039-6028(99)00504-x

Cited by 6 publications

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References 14 publications

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“…The prerequisites for this effect are the orientation of the photons and the alignment of the electronic states [7]. The first is realized by the linear polarization of the photons whereas the second might be produced by the alignment of the molecular axes or by the symmetry of the bands in a solid.…”

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Symmetry of Valence States of Heusler Compounds Explored by Linear Dichroism in Hard-X-Ray Photoelectron Spectroscopy

et al. 2011

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This study reports on the linear dichroism in angular-resolved photoemission from the valence band of the Heusler compounds NiTi0.9Sc0.1Sn and NiMnSb. High-resolution photoelectron spectroscopy was performed with an excitation energy of hν = 7.938 keV. The linear polarization of the photons was changed using an in-vacuum diamond phase retarder. The valence band spectra exhibit the typical structure expected from first-principles calculations of the electronic structure of these compounds. Noticeable linear dichroism is found in the valence band of both materials, and this allows for a symmetry analysis of the contributing states. The differences in the spectra are found to be caused by symmetry-dependent angular asymmetry parameters, and these occur even in polycrystalline samples without preferential crystallographic orientation.

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Symmetry of Valence States of Heusler Compounds Explored by Linear Dichroism in Hard-X-Ray Photoelectron Spectroscopy

et al. 2011

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“…12 There is also good agreement with a previous work determining optical constants at the same system. 13 There, the parameters z 0 = 2.3Å and Λ e = 3.2Å have been obtained as side results from a fit of the dichroism scanning the photon angle of incidence.…”

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An Experimental Proof of the Back-Scattering Model for Dichroic Effects in Vuv Photoemission

et al. 2002

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The energy dependence of the circular dichroism in the angular distribution of photoelectrons (CDAD) was investigated from the shallow Cs 5p core levels. Cesium was prepared in a hexagonal ordered monolayer on W(110). The results are mainly influenced by scattering of the photoelectrons within the adlayer. At low energies, the behavior observed is described by means of a model that treats only the back-scattering of photoelectrons at the potential step between the adlayer and the substrate. It leads to a simple method determining the position of the monolayer with respect to the substrate. In this approach, the back-scattering model is matched with the measured energy dependence of the CDAD between hν = 21 eV and hν = 33 eV. This procedure yields reliable results already for a single observation angle of the photoelectron. The distance between cesium and tungsten was determined to be (2.2 ± 0.1)Å, which corresponds to the effective distance between the center of the adsorbed layer and the potential step between the layer and the substrate. Finally, the fitted result was proven to meet the complete angular dependence of the CDAD at different photon energies.

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Induced circular dichroism and spin polarization in the angular distribution of photoelectrons by optical properties of adsorbate systems

Chassé

Niebergall

2003

Surface Science

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Determining the optical properties of adsorbate covered surfaces by dichroism in VUV-photoemission

Cited by 6 publications

References 14 publications

Symmetry of Valence States of Heusler Compounds Explored by Linear Dichroism in Hard-X-Ray Photoelectron Spectroscopy

Symmetry of Valence States of Heusler Compounds Explored by Linear Dichroism in Hard-X-Ray Photoelectron Spectroscopy

An Experimental Proof of the Back-Scattering Model for Dichroic Effects in Vuv Photoemission

Induced circular dichroism and spin polarization in the angular distribution of photoelectrons by optical properties of adsorbate systems

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