The Debye beamline at SLS was funded by the ETH Council, PSI and EPFL with a Joint Strategic Initiative proposal entitled "Rapid Access X-ray Chemical and Structural Analysis at SLS" and is now entering user operation.
Tailored towards the chemistry and material science communities the envisioned Debye beamline provides access to state-of-the-art X-ray tools (quick scanning X-ray absorption spectroscopy and powder X-ray diffraction) together with infrastructure (reaction cells, potentiostat, mass spectrometer, reactive gases up to 60 bar) for high-throughput operando experiments. The heart of the beamline is the QEXAFS monochromator which developed on top of the highly successful monochromator installed at the SuperXAS beamline offering sub second X-ray absorption spectroscopy data. The design of the beamline has focused on a wide photon energy range of 4.5 to 60 keV (thanks to a 5 T magnet and a 2.7 GeV SLS 2.0 ring) and multiple operation modes such as monochromatic-beam or pink-beam and focused or partially unfocused beam promising to offer a unique platform at SLS for combined X-ray based analysis tools.
| Person | Position | Phone | |
|---|---|---|---|
| Maarten Nachtegaal | Group Leader | maarten.nachtegaal@psi.ch | +41 56 310 3056 |
| Adam H Clark | Scientist | adam.clark@psi.ch | +41 56 310 4151 |
| Stephan Hitz | Engineer | stephan.hitz@psi.ch | +41 56 310 2429 |
| Simon Tiefenbacher | Technician | simon.tiefenbacher@psi.ch | +41 56 310 2150 |
Experiment Types
- Quick Scanning X-ray absorption spectroscopy
- Transmission geometry with gridded ionisation chambers
- Total fluorescence yield with a large area PIPS detector
- Time resolution <125 ms
- Continuous scanning fluorescence detected XAS
- Partial fluorescence yield with a 7 element SDD for detection >10 ppm metal content
- Time resolution <10 s
- Combined XRD-XAS (early commissioning phase)
- Triggered XRD pattern collection below absorption edge
- Operation mode dependent on anticipated diffraction pattern, contact beamline staff for discussion
- Time resolution <1 s
| Energy Range | 4.5 - 45 keV | |
| Flux on sample | 1 x 1012 ph/s @ 12 keV | 1 x 1010 ph/s @ 45 keV |
| Beam size on sample | 30 x 60 µm2 to 26 x 2 mm2 | |
| Intrinsic energy resolution | 1.1 x 10-4 for Si(111) | 2.8 x 10-5 for Si(311) |
| Absorption Edges | Ti-Pm K edges | Cs - Bi L edges |