Analysis of the halo background in femtosecond slicing experiments
- The slicing facility FemtoSpeX at BESSY II offers unique opportunities to study photo-induced dynamics on femtosecond time scales by means of X-ray magnetic circular dichroism, resonant and non-resonant X-ray diffraction, and X-ray absorption spectroscopy experiments in the soft X-ray regime. Besides femtosecond X-ray pulses, slicing sources inherently also produce a so-called `halo' background with a different time structure, polarization and pointing. Here a detailed experimental characterization of the halo radiation is presented, and a method is demonstrated for its correct and unambiguous removal from femtosecond time-resolved data using a special laser triggering scheme as well as analytical models. Examples are given for time-resolved measurements with corresponding halo correction, and errors of the relevant physical quantities caused by either neglecting or by applying a simplified model to describe this background are estimated.
Author details: | Daniel Schick, Loic Le Guyader, Niko Pontius, Ilie Radu, Torsten KachelORCiD, Rolf MitznerORCiDGND, Thomas Zeschke, Christian Schuessler-LangeheineORCiD, Alexander FöhlischORCiDGND, Karsten Holldack |
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DOI: | https://doi.org/10.1107/S160057751600401X |
ISSN: | 1600-5775 |
Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/27140149 |
Title of parent work (English): | Journal of synchrotron radiation |
Publisher: | International Union of Crystallography |
Place of publishing: | Chester |
Publication type: | Article |
Language: | English |
Year of first publication: | 2016 |
Publication year: | 2016 |
Release date: | 2020/03/22 |
Tag: | X-ray scattering; XMCD; femtosecond slicing; halo; pump-probe |
Volume: | 23 |
Number of pages: | 12 |
First page: | 700 |
Last Page: | 711 |
Funding institution: | Helmholtz Association [PD-142]; European Union through FEMTOSPIN program; Peter-Paul-Ewald Fellowship of the Volkswagen Stiftung |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
Peer review: | Referiert |