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
Time-resolved absorption, NEXAFS, Mass Spectrometry, XPS, NAP-XPS
depends on experiment - please discuss with Instrument Scientist
|Energy range||80 - 2000 eV|
|Energy resolution||>15,000 at 400eV|
|Flux||6x1e10 photons/s/0.1A with 111µm exit slit|
|Focus size (hor. x vert.)||100x80 µm2|
|Phone||+49 30 8062 14905 / 14906|
|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.|
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.