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- Title
Analysis of the halo background in femtosecond slicing experiments.
- Authors
Schick, Daniel; Le Guyader, Loïc; Pontius, Niko; Radu, Ilie; Kachel, Torsten; Mitzner, Rolf; Zeschke, Thomas; Schüβler-Langeheine, Christian; Föhlisch, Alexander; Holldack, Karsten
- Abstract
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.
- Subjects
X-ray absorption; FEMTOSECOND lasers; PUMP probe spectroscopy; HALOS (Meteorology); MAGNETIC circular dichroism; PHASE transitions; PHOTON flux
- Publication
Journal of Synchrotron Radiation, 2016, Vol 23, Issue 3, p700
- ISSN
0909-0495
- Publication type
Article
- DOI
10.1107/S160057751600401X