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.