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Beamline: E1 (FLIPPER II)

Experimental Station for Photoelectron Spectroscopy

FLIPPER II is a unique VUV and soft X-xay plane-grating monochromator covering the photon energy range from 10-150 eV with excellent resolution and freedom from higher-order light. The exit slit of the monochromator is positioned close to the sample in the photoemission analyzer chamber so that small samples can be measured.

The extensive sample preparation and characterization facilities of this station make it particularly valuable for the preparation of samples that are also investigated on other beamlines at HASYLAB. The photoemission system is equipped with a UHV transfer system that enables the freshly prepared samples to be investigated using surface X-ray diffraction on wiggler beamlines BW2 and W1.

The same transfer system is used in the surface science laboratory at the Institute for Experimental Physics where a variety of scanning probe microscopes, including a 4K low-temperature STM, are available to characterize the surface morphology and electronic structure of the samples with atomic resolution.

Research at this beamline:

Currently the research activities center on the electronic structure of novel organic molecules for opto- and molecular electronics applications. These molecules have been investigated with great success. In particular X-ray studies provide a wealth of information: in recent studies on self-assembled InAs and AlAs quantum dots grown using MBE on GaAs substrates, it was possible to derive the strain and composition profiles within the dots and the surrounding substrate. The transfer chamber concept opens up the possibility to fully characterize both the electronic properties and the surface structure and morphology with atomic resolution by combining photoemission studies with surface X-ray diffraction measurements on the same sample.