nmTransmission NEXAFS

Saturation free and time resolved soft X-ray absorption on liquids and colloids for UE52-SGM

This instrument is dedicated to time-resolved and steady-state soft x-ray absorption spectroscopy (XAS/NEXAFS/XANES/EXAFS) in transmission on liquid samples and solids. The liquid sample is continuously refreshed in a flatjet system. The transmitted intensity of synchrotron radiation for ground state NEXAFS is measured with a gallium arsenide photodiode (average diode current is recorded). For static measurements, the full filling pattern of BESSY II is used. For time-resolved measurements, a MHz laser excites the sample and an avalanche photo diode detects the time-dependent signal.

Anwendungsbeispiele:
  • Photo-induced ligand substitution
  • Proton transfer - systematic investigations
  • Electronic structure changes upon UV excitation
  • Detection of excited states by photoabsorption


Methods

EXAFS, Time-resolved absorption, NEXAFS

Remote access

depends on experiment - please discuss with Instrument Scientist

Beamline data
Energy range 100 - 1500 eV
Energy resolution > 4,000
Flux > 1012
Polarisation variable
Focus size (hor. x vert.) 60 µm (hor)
Phone +49 30 8062 13431
Weitere Details UE52_SGM
Station data
Temperature range room temperature
Pressure range <10-3 mbar
Detector gallium arsenide photo (GaAsP) diode or avalanche photo diode (APD)
Manipulators X, Y, Z and rotation stage available
Sample holder compatibility -
Additional equipment MHz laser for time-resolved measurements:
• Power – 30 W
• Rep. rate – tunable from 2 MHz down to KHz
• Pulse duration – from 300 fs to 10 ps
• Wavelenght – 1030 nm, 515 nm, 343 nm and 258 nm
Proben Thin liquid films

Apparatur für zeitaufgelöste und statische Weichröntgen-Absorptionsspektroskopie (XAS/NEXAFS/XANES/EXAFS) in Transmission an Flüssigkeiten. Für Details siehe: M. Fondell, S. Eckert, R. M. Jay, C. Weniger, W. Quevedo, J. Niskanen, B. Kennedy, F. Sorgenfrei, D. Shick, E. Giangrisostomi, R. Ovsyannikov, K. Adamzyk, N. Huse, P. Wernet, R. Mitzner, A. Föhlisch, "Time-resolved soft X-ray absorption spectroscopy in transmission mode on liquids at MHz repetition rates", Structural dynamics 4, 054902 (2017).