BElChem-PGM station

BElChem-PGM station

The scientific aim at the BElChem-PGM station 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^(-12) 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
  • log-in methodology applying the beamline chopper to modulate the incoming X-ray induced signal

Methods

Time-resolved absorption, NEXAFS, EXAFS, Mass Spectrometry, XPS

Remote access

depends on experiment - please discuss with Instrument Scientist

Beamline data
Energy range 90 - 1300 eV
Energy resolution 80000 at 64eV
Flux 4.00E+13 photons/s@300mA
Polarisation • horizontal
• vertical
• circular
Focus size (hor. x vert.) < 90 µm X slit size
Phone +49 30 8062 14842
More details BElChem-PGM
Station data
AP-XPS
Temperature range room temperature up to 1000 K
Pressure range Maximum pressure: 20 mbar
Minimum pressure: 10-12 mbar
Typical pressure: 1 mbar

For more details contact the instrument scientist.
Detector 1D delay line detector (1D DLD) (SURFACE CONCEPT, Mainz)
Manipulators various, exchangeable for optimised sample environments
Sample holder compatibility Homemade concept. For details contact the instrument scientist.
Additional equipment PRISMA 200 mass spectrometer, FISHER SCIENTIFIC gas chromatograph, process gas pumping line, electrolyte dosing module with perestaltic pump

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.