Dr. Michael Reichling Free University of Berlin
4 PM, Thursday, November 16, 1995
Room 101, Olin Physical Laboratory
The process of electron-induced surface metallization of the CaF2 (111)-surface is invetigated by scanning force microscopy (SFM) in air. It is demonstrated how the metallization efficiency and different morphologies are determined by the main experimental parameters like irradiation time, intensity and dose. UHV measurements reveal new phenomena at the onset of metallization at samll doses. Furthermore the structure and dynamics of the cleaved surface is investigated and surface properties from air-cleaved and UHV-cleaved surfaces are compared. Results on CaF2 representing the fluorite structure are compared to those from halides with the NaCl-structure.