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This study was written while I was a doctoral student in the Graduier tenkolleg Finanz-und Gutermiirkte at the University of Mannheim; it has been accepted as a doctoral dissertation in February 1997. I am indebted to my advisors, Professors Axel Borsch-Supan and Martin Hellwig at Mannheim and John Rust at Madison, for their encouragement and for many helpful discussions and comments. At various stages, I benefited from comments on portions of the manu script by, and from discussions with, Thomas Astebro, Charles Calomiris, Timothy Dunne, Frank Gerhard, Annette Kohler, Jens Koke, Stephan...

Inthepastfewdecades, greatprogresshasbeenmadeinthe?eldofdynamical interactions of photons and charged particles with surfaces. Developments in this ?eld have largely been driven by technological advances. Foremost, the preparation and characterization of atomically ?at surfaces has opened up opportunities to precisely and reproducibly investigate surface structure and dynamics in unprecedented detail. An equally important advance represents the availability of new sources for projectiles interacting with and probing surfaces. Third-generation s- chrotron sources provide high-brilliance photon...

Inthepastfewdecades, greatprogresshasbeenmadeinthe?eldofdynamical interactions of photons and charged particles with surfaces. Developments in this ?eld have largely been driven by technological advances. Foremost, the preparation and characterization of atomically ?at surfaces has opened up opportunities to precisely and reproducibly investigate surface structure and dynamics in unprecedented detail. An equally important advance represents the availability of new sources for projectiles interacting with and probing surfaces. Third-generation s- chrotron sources provide high-brilliance photon...