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European VUV synchroton radiation research at Bessy (ESRB)

Objective


Some significant findings were:

- Pioneering work on the influence of surface photovoltage on the determination of the Schotty barrier height. New experiments were performed on previously published discrepancies. This work produced new data on a 20-year old scientific question: how to correctly analyze photoelectron spectra of metal semiconductor interfaces to determine the Schotty barrier height.

- A study of the silver overlayers on Gallium arsenide single crystal surfaces. During this research scientists observed that the metal islands which form upon deposition organise in a narrow site distribution. This observation led to the observation of quantum size effects due to electron confinement in the silver valence level photoelectron spectra.

- One of the visiting researchers developed photoelectron diffraction experiments and a data analysis method which is unique for very precise determination of adsorption sites for many systems where extended X-ray adsorption fine structure experiments fail. Also the intensity modulation from which the adsorption site is determined is an order of magnitude larger.
Through the grant 121 individual users from 42 user groups in 10 EU Member States were able to work at Bessy, using a total of 650 weeks of synchrotron radiation beam time. The represented 8.4% of the total beam time available to users in the basic research area. In particular a large number of scientists from countries without an operating national light source had access to Bessy.

Outside of this project, many of these visiting scientists would not have had access to this type of synchrotron radiation equipment. Visiting researchers participating in the project published 110 research reports in refereed journals after their visits. Among the findings are outstanding contributions in semi-conductor physics, surface science and instrumental development.

Two workshops covering the application of synchrotron radiation were held in Portugal and Greece. The first gathering hosted 44 participants, and 16 speakers who are senior users at the four EU supported European Synchrotron Radiation facilities. The second meeting hosted 55 Greek and 9 German scientists. A new beam line for high resolution spectroscopy was installed and a new high resolution ultra-high vacuum chamber was designed and constructed for photoelectron spectroscopy and X-ray absorption techniques.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

BERLINER ELEKTRONENSPEICHERRING-GESELLSCHAFT FUER SYNCHROTRONSTRAHLUNG GMBH
Address
Albert-einstein Strasse 15
12489 Berlin
Germany