Hochaufloesende Resonanzionisationsspektroskopie an Samarium und Gadolinium

Within this work spectroscopic studies of Gadolinium and Samarium by multi-step resonance ionization were carried out, significantly extending the application of RIMS in complex atomic systems. In Samarium isotope shift and hyperfine structure of the first resonant transition were investigated and in addition, long, undisturbed Rydberg series just below the first ionization limit were measured for the first time. For the strongest one the limit of convergence was determined and an isotope specific ionization energy of IP=45519.30793(43) cm-1 for "1"5"4Sm was derived. Due to their atomic properties Gadolinium and Samarium have a quite complex structure in the continuum characterised by very strong and narrow resonances. A systematic analysis of this structure based on existing as well as new data was part of this work. For a theoretical description of interfering autoionising states the applicability of the K-matrix-formalism, originally outlined for nuclear physics, was successfully demonstrated for different selected regions of both the Gadolinium and the Samarium autoionizing spectra. As a development step towards analytical RIMS application for bio-medical problems it was demonstrated in Gadolinium that necessary specifications can be fulfilled using pulsed lasers. This will significantly simplify further investigations in this field. (orig.)Available from: http://deposit.ddb.de/cgi-bin/dokserv?idn=972646140 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman