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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Electronic structure of bimetallic systems - study of gas molecule interaction
 Píš, Igor ; Nehasil, Václav (advisor) ; Bartoš, Igor (referee) ; Polčík, Martin (referee)
Bimetallic Rh-V system was studied by means of surface science experimental methods. Properties of ultra-thin Rh-V layers supported by γ-Al2O3 were compared with model systems prepared by vacuum V deposition on Rh(111), Rh(110) and polycrystalline rhodium. Formation of ordered V- Rh(111)-(2×2), V-Rh(110)-(2×1) and V-Rh(110)-(1×2) subsurface alloys and their electronic and atomic structure were investigated and models of the surface reconstructions were proposed. Influence of the subsurface alloy formation on interaction with CO and O2 molecules as well as the influence of the molecule adsorption on this alloy was investigated. The bond between CO molecules and Rh-V alloy surface was weakened due to pronounced changes in surface valence band structure. Oxygen which adsorbed on the alloy surface reacted with the subsurface vanadium at elevated temperature and blocked the interaction of the metal substrate with CO molecules.
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Difrakční měření na zdrojích synchrotronového záření
 Hašek, Jindřich
The paper summarizes the present state of art in the use of different sources of synchrotron radiation in protein structure determination and discusses possibility of the future development. Current experiences with the newly developed "small intensive sources of radiation" MIRROCLE and LYNCEAN indicate that the practical usage of these sources needs really long and difficult development. The three XFEL instruments presently under construction in Japan, USA and Germany will open new areas for science. They are complementary to current synchrotron equipment used for protein crystallography but cannot substitute it and the current sources of synchrotron radiation of the third generation equipped by undulators will remain dominant at least in the next decade.
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