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Alexei Erko
Researcher at Helmholtz-Zentrum Berlin
Publications - 121
Citations - 1776
Alexei Erko is an academic researcher from Helmholtz-Zentrum Berlin. The author has contributed to research in topics: Monochromator & Beamline. The author has an hindex of 22, co-authored 116 publications receiving 1599 citations. Previous affiliations of Alexei Erko include Free University of Berlin.
Papers
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BookDOI
Modern developments in X-ray and neutron optics
TL;DR: The BESSY Raytrace Program RAY (BESSIDRA) as mentioned in this paper uses RESTRAX to propagate wavefront propagation for X-ray and Neutron optical systems.
Journal ArticleDOI
A new experimental station for simultaneous X-ray microbeam scanning for small- and wide-angle scattering and fluorescence at BESSY II
Oskar Paris,Chenghao Li,Stefan Siegel,Gundolf Weseloh,Gundolf Weseloh,Franziska Emmerling,Heinrich Riesemeier,Alexei Erko,Peter Fratzl +8 more
TL;DR: In this paper, a new instrument for simultaneous microbeam small and wide-angle X-ray scattering and Xray fluorescence (SAXS/WAXS)/XRF) is presented.
Journal ArticleDOI
FemtoSpeX: a versatile optical pump–soft X-ray probe facility with 100 fs X-ray pulses of variable polarization
Karsten Holldack,Johannes Bahrdt,Andreas Balzer,Uwe Bovensiepen,Maria Brzhezinskaya,Alexei Erko,A. Eschenlohr,Rolf Follath,Rolf Follath,Alexander Firsov,Winfried Frentrup,L. Le Guyader,Torsten Kachel,Peter Kuske,Rolf Mitzner,Roland Müller,Niko Pontius,T. Quast,Ilie Radu,J.-S. Schmidt,Christian Schüßler-Langeheine,Mike Sperling,Christian Stamm,Christian Stamm,Christoph Trabant,Christoph Trabant,Alexander Föhlisch +26 more
TL;DR: Here the major upgrades of the femtoslicing facility at BESSY II are reviewed, giving a tutorial on how elliptical-polarized ultrashort soft X-ray pulses from electron storage rings are generated at high repetition rates.
Journal ArticleDOI
L-edge X-ray absorption spectroscopy of dilute systems relevant to metalloproteins using an X-ray free-electron laser.
Rolf Mitzner,Jens Rehanek,Jan Kern,Sheraz Gul,Johan Hattne,Taketo Taguchi,Roberto Alonso-Mori,Rosalie Tran,Christian Weniger,Henning Schroeder,Wilson Quevedo,Hartawan Laksmono,Raymond G. Sierra,Guangye Han,Benedikt Lassalle-Kaiser,Sergey Koroidov,Katharina Kubicek,Simon Schreck,Kristjan Kunnus,Maria Brzhezinskaya,Alexander Firsov,Michael P. Minitti,Joshua J. Turner,Stefan Moeller,Nicholas K. Sauter,Michael J. Bogan,Dennis Nordlund,William F. Schlotter,Johannes Messinger,Andrew S. Borovik,Simone Techert,Frank M. F. de Groot,Alexander Foehlisch,Alexei Erko,Uwe Bergmann,Vittal K. Yachandra,Philippe Wernet,Junko Yano +37 more
TL;DR: It is shown that the deviations of the partial-fluorescence yield-detected spectra from the true absorption can be well modeled using the state-dependence of the fluorescence yield, and implications for the application of the concept to biological samples are discussed.
Journal ArticleDOI
Probing the oxidation state of transition metal complexes: a case study on how charge and spin densities determine Mn L-edge X-ray absorption energies
Markus Kubin,Meiyuan Guo,Thomas Kroll,Heike Löchel,Erik Källman,Michael L. Baker,Rolf Mitzner,Sheraz Gul,Jan Kern,Jan Kern,Alexander Föhlisch,Alexander Föhlisch,Alexei Erko,Uwe Bergmann,Vittal K. Yachandra,Junko Yano,Marcus Lundberg,Philippe Wernet +17 more
TL;DR: A combined experimental and theoretical approach reveals correlations of metal L-edge X-ray absorption energies to local charge and spin densities.