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
Time-resolved absorption, NEXAFS, EXAFS
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).