Momentum resolution in inverse photoemission

We present a method to determine the electron beam divergence, and thus the momentum resolution, of an inverse-photoemission setup directly from a series of spectra measured on Cu(111). Simulating these spectra with different beam divergences shows a distinct influence of the divergence on the appea...

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Veröffentlicht in:Review of scientific instruments 2015-01, Vol.86 (1), p.013908-013908
Hauptverfasser: Zumbülte, A, Schmidt, A B, Donath, M
Format: Artikel
Sprache:eng
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Zusammenfassung:We present a method to determine the electron beam divergence, and thus the momentum resolution, of an inverse-photoemission setup directly from a series of spectra measured on Cu(111). Simulating these spectra with different beam divergences shows a distinct influence of the divergence on the appearance of the Shockley surface state. Upon crossing the Fermi level, its rise in intensity can be directly linked with the beam divergence. A comparison of measurement and simulation enables us to quantify the momentum resolution independent of surface quality, energy resolution, and experimental geometry. With spin resolution, a single spectrum taken around the Fermi momentum of a spin-split surface state, e.g., on Au(111), is sufficient to derive the momentum resolution of an inverse-photoemission setup.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4906508