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SIM - X11MA: Surfaces / Interfaces: Microscopy

The SIM beamline produces a high flux of soft X-rays with variable polarization from an undulator source. The beamline has one permanent endstation open to user via the SLS proposals system: The permanent endstation of the SIM beamline is a Photoemission Electron Microscope (PEEM) (Model: LEEM III, Elmitec GmbH). It allows to image samples using the photoelectric effect with very high spatial resolution (100 nm), chemical and magnetic sensitivity. With an energy analyzer the excited photoelectrons can be energy-selected. In addition to illumination by X-rays, illumination by low energy electrons is possible. In this low energy electron microscopy (LEEM) mode additional contrast mechanisms are available.

The PEEM is equipped with a small preparation chamber (sputtering, heating, load-lock). In addition, a more complete preparation system is available with a load-lock, LEED and Auger, several evaporation sources, rotatable electromagnetic coil, ion etching and electron bombardment heating.

Users can apply for beamtime with the PEEM or with their own endstation (after prior consulation with the beamline scientist).

The SIM beamline is operated by the Microscopy and Magnetism Group.
Energy range 90-2000 eV
Flux (1 keV) 1 x 10^15 photons / s / 0.1%BW / 0.4 A
Focused spot size 30 µm x 100 µm (V x H)
Spectral resolution > 5000
Polarization Linear: 0 deg (horizontal) to 90 deg (vertical)
Circular: right / left
Endstation ES1 Photoemission electron microscope with spatial resolution = 100 nm,
variable sample temperature: 120 - 1'800 K.
Endstation ES3 XMCD chamber for total electron yield (TEY) measurements in applied field
(130 mT) and variable sample temperature (15 - 300 K).
Endstation ES4 Presently RESOXS, NAPP. (These endstations belong to user groups and can only be used in collaboration with them)