Open AccessBand mapping in x-ray photoelectron spectroscopy: An experimental and theoretical study of W(110) with 1.25 keV excitation
Author(s) -
Christian Papp,
Ł. Pluciński,
J. Minář,
Jürgen Braun,
H. Ebert,
Claus M. Schneider,
C. S. Fadley
Publication year - 2011
Publication title -
physical review. b, condensed matter and materials physics
Language(s) - English
Resource type - Journals
eISSN - 1538-4489
pISSN - 1098-0121
DOI - 10.1103/physrevb.84.045433
Subject(s) - angle resolved photoemission spectroscopy , physics , atomic physics , photoemission spectroscopy , spectral line , photon energy , x ray photoelectron spectroscopy , spectroscopy , inverse photoemission spectroscopy , photon , excitation , electronic structure , condensed matter physics , optics , quantum mechanics , nuclear magnetic resonance
Angle-resolved photoemission spectroscopy (ARPES) has generally been carried out at energies below similar to 150 eV, but there is growing interest in going to higher energies so as to achieve greater bulk sensitivity. To this end, we have measured ARPES spectra from a tungsten (110) crystal in a plane containing the [100], [110], and [010] directions with a photon energy of 1253.6 eV. The experimental data are compared to free-electron final-state calculations in an extended zone scheme with no inclusion of matrix elements, as well as highly accurate one-step theory including matrix elements. Both models provide further insight into such future higher-energy ARPES measurements. Special effects occurring in a higher-energy ARPES experiment, such as photon momentum, phonon-induced zone averaging effects, and the degree of cryogenic cooling required are discussed, together with qualitative predictions via appropriate Debye-Waller factors for future experiments with a number of representative elements being presented