Photoemission and Atomic Resolution Laboratory

PEARL is dedicated to the structural characterisation of local bonding geometry of molecular adsorbates on metal or semiconductor surfaces, of nanostructured surfaces, and of surfaces of complex materials.

The laboratory features a soft X-ray beamline with an angle-resolved photoelectron spectrometer for angle-scanned and photon energy-scanned X-ray photoelectron spectroscopy (XPS, ARPES) and diffraction (XPD/PhD). A low-temperature scanning tunnelling microscope (STM) provides a complementary real-space view of the sample. In-situ surface preparation facilities, organic evaporators, and ports for user-supplied equipment are also available.

The beamline is operational and open to general users, cf. User Information. For further information please refer to our beamline article, or contact the beamline scientist,
Energy range 60 - 2000 eV
Photon Flux 2 × 1011 ph/s at 1 keV on sample
Spectral resolution E/dE up to 7000 at 400 eV
Spot size 170 μm H x 73 μm V FWHM
1.0 mm x 1.0 mm
Polarization Linear horizontal
Partial circular right/left
Endstation Angle-resolved photoelectron spectroscopy (ARPES, XPS, XPD/PhD)
Scanning tunnelling microscopy (STM, STS)
In-situ surface preparation facilities
The PEARL beamline is operated by the Microscopy and Magnetism Group. It has been developed and funded in collaboration with a consortium of five Swiss research institutions.