Combined experimental setup for spin- and angle-resolved direct and inverse photoemission

Journal Article · Thu Nov 15 00:00:00 EST 2007 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2813345· OSTI ID:21024594

Budke, M; Allmers, T; Donath, M; Rangelov, G ^[1]

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1. Physikalisches Institut, Westfaelische Wilhelms-Universitaet Muenster, Wilhelm-Klemm-Str. 10, 48149 Muenster (Germany)

We present a combined experimental setup for spin- and angle-resolved direct and inverse photoemission in the vacuum ultraviolet energy range for measurements of the electronic structure below and above the Fermi level. Both techniques are installed in one ultrahigh-vacuum chamber and, as a consequence, allow quasisimultaneous measurements on one and the same sample preparation. The photoemission experiment consists of a gas discharge lamp and an electron energy analyzer equipped with a spin polarization detector based on spin-polarized low-energy electron diffraction. Our homemade inverse-photoemission spectrometer comprises a GaAs photocathode as spin-polarized electron source and Geiger-Mueller counters for photon detection at a fixed energy of 9.9 eV. The total energy resolution of the experiment is better than 50 meV for photoemission and better than 200 meV for inverse photoemission. The performance of our combined direct and inverse-photoemission experiment with respect to angular and energy resolutions is exemplified by the Fermi-level crossing of the Cu(111) L-gap surface state. Spin-resolved measurements of Co films on Cu(001) are used to characterize the Sherman function of the spin polarization detector as well as the spin polarization of our electron source.

• OSTI ID: 21024594
• Journal Information: Review of Scientific Instruments, Vol. 78, Issue 11; Other Information: DOI: 10.1063/1.2813345; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ELECTRON DIFFRACTION
ELECTRON SOURCES
ELECTRONIC STRUCTURE
ELECTRONS
ENERGY RESOLUTION
EV RANGE
FERMI LEVEL
GALLIUM ARSENIDES
GEIGER-MUELLER COUNTERS
MEV RANGE
PHOTOCATHODES
PHOTOELECTRON SPECTROSCOPY
PHOTOEMISSION
PHOTONS
SEMICONDUCTOR MATERIALS
SPECTROMETERS
SPIN
SPIN ORIENTATION
ULTRAVIOLET RADIATION