Interaction of femtosecond X-ray pulses with periodical multilayer structures [Elektronische Ressource] / vorgelegt von Dmitriy Ksenzov

INTERACTION OF FEMTOSECOND X-RAY PULSESWITH PERIODICAL MULTILAYER STRUCTURESDissertationzur Erlangung des Grades eines Doktors der Naturwissenschaftenvorgelegt vonD.P.Dmitriy Ksenzovgeb. am 19.12.1977 in Zhodino (Belarus)eingereicht beim Fachbereich -7, Physikder Universität SiegenSiegen 20101. Gutachter: Prof. Dr. Ullrich Pietsch2. Gutachter: Prof. Dr. Ilya FeranchukDisputation:Prüfer:2AbstractThe VUV Free Electron Laser FLASH operates in soft X-ray range and produces high-intensive pulsetrains with few tens femtoseconds duration. The transversely fully coherent beam will open newexperiments in solid state physics which can not be studied with present radiation sources.The study of the time dependent response of the multilayer to the X-ray pulse can provideinsights into the process of interaction of highly intense FEL radiation with matter. To test the influenceof electron excitation on the optical properties of boron carbide, the refractive index of B C was measured4near B K-edge by energy-resolved photon-in-photon-out method probing a Bragg reflection fromperiodical multilayers. The measured data clearly show that the variation of the fine structure of the K-absorption edges due to the chemical nature of the absorber element.The knowledge obtained from experiments with continuous radiation was used to design therespective experiments with pulse from the FEL.