ISISS station
Innovative Station for In Situ Spectroscopy
The scientific aim at ISISS is to study the electronic surface/near surface structure of functional materials in the presence of a reactive environment. This includes both gas/solid interfaces (e.g. heterogeneous catalysis) and liquid/solid interfaces (e.g. catalytic water splitting).
Selected Applications:- X-ray photoelectron spectroscopy (XPS) under high vacuum (p=10^(-8) mbar) and near ambient pressure conditions (typically 1 mbar)
- X-ray aborption spectroscopy (XAS) at pressure up to 10 mbar with NAP-HE-XPS endstation
Methods
NEXAFS, Time-resolved absorption, NAP-XPS, XPS, Mass Spectrometry
Remote access
depends on experiment - please discuss with Instrument Scientist
Beamline data | |
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Energy range | 80 - 2000 eV |
Energy resolution | >15,000 at 400eV |
Flux | 6x1e10 photons/s/0.1A with 111µm exit slit |
Polarisation | linear horizontal |
Focus size (hor. x vert.) | 100x80 µm2 |
Phone | +49 30 8062 14905 / 14906 |
More details | ISISS |
Station data | |
NAP-HE-XPS | |
Temperature range | room temperature up to 1000 K |
Pressure range | Maximum pressure: 20 mbar Minimum pressure: 10-8 mbar Typical pressure: 1 mbar For more details contact the instrument scientist. |
Detector | 2D delay line detector (2D DLD) (SURFACE CONCEPT, Mainz) |
Manipulators | various, exchangeable with optimised for sample environments |
Sample holder compatibility | Homemade concept. Check text below. For more details contact the station manager. |
Additional equipment | |
gas analytics |
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The spectrometer (right site) is displayed retracted from the XPS cell module (left side).
Table 1: Gas analytics
Table 2: Laboratory facilities at ISISS
Obviously, the understanding of the interaction of a catalyst surface with the reactants plays a key role in a detailed description of catalytic processes. X-ray photoelectron spectroscopy (XPS) is a well-established powerful tool to study in detail the outermost surface of solids but it was traditionally restricted to high vacuum and low pressure conditions. However, recently a methodology based on a differentially pumped electrostatic lens system has gained much interest.
The Fritz-Haber-Institut der MPG has operated at BESSY such an instrument since 2002 at different undulator based beamlines. In 2007 a beamline (ISISS) dedicated to near ambient pressure XPS (NAP-XPS) experiments has been implemented at HZB/BESSY II. A further improved version of this instrument is installed as the ISISS beamline since June 2013. A picture of the set-up can be seen as Fig. 1 while Fig. 2 shows a sketch of the main components.