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Seminars Archive

HAXPES at PETRA III: electronic structure, operando devices and in-situ catalysis

Christoph Schlueter (Photon Science, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany)
Tue 10 Mar, at 14:30 - Fermi room

Abstract
In September 2018, a new X-ray undulator beamline (P22), fully dedicated to hard X-ray photoelectron spectroscopy (HAXPES) techniques, opened to users. This beamline has been designed to the specific needs of the HAXPES user community [1,2]. Adaptive beam focusing is realized by Be compound refractive lenses and/or horizontally deflecting mirrors down to a spot size of ~15x17 µm^2 with a flux of up to 1.1x10^13 ph/s (for Si(111) at 6 keV). P22 hosts four specialised experimental end stations for high-resolution studies of the electronic and chemical structure of complex materials, realistic device-like structures and catalytic interfaces. The main instrument for conventional HAXPES techniques offers sample cooling and in-situ electrical characterisation for operando studies. A separate instrument provides full-field, sub- m electron spectro-microscopy (HAXPEEM). Additionally, a specialized setup for high-pressure HAXPES applications (POLARIS) recently demonstrated its capabilities at pressures >2.0 bar.[3] Finally, a full-field k-microscope with time-of-flight energy discrimination delivered first fully k-resolved valence band structures in the HAXPES energy range (up to 7 keV).[4-6] All instruments are implemented and operated in close collaboration with external user groups and as such reflect the wide range of scientific fields currently covered by our community. Following a short presentation of the beamline capabilities I will highlight recent results from the instruments operated at P22.

REFERENCES
1. Schlueter, C., Gloskovskii, A., et al. AIP conference proceedings 2054(1), 040010 (2019)
2. Schlueter, C., Gloskovskii, A., et al. Synchrotron Radiation News 31 29-35 (2018)
3. Amann, P., et al. Review of Scientific Instruments 90 103102 (2019)
4. Babenkov, S., Medjanik, K., Vasilyev, D. et al. Communications Physics 2 107 (2019)
5. Medjanik, K., Journal of Synchrotron Radiation 26 1996-2012 (2019) 6. Fedchenko, O., et al. New Journal of Physics 21 113031 (2019)

(Referer: G. Panaccione)
Ultima modifica il Martedì, 24 Aprile 2012 15:21