Datensatz

Zusammenfassung

Due to the presence of 4p and 4d open shells, the electronic structure of highly charged bismuth ions is particularly di_cult to calculate. Since practically no experimental data for these ions are available, the optical spectrum of Bi ions in charge states q = 36 to 55 was systematically investigated. The ions were produced with the Heidelberg Electron Beam Ion Trap, and the spectra observed by means of a Czerny-Turner spectrometer. A total of 25 previously unknown spectral lines were found, and their wavelengths determined with a relative accuracy of 170 ppm and better.Furthermore, in the second part of this work a spectrometer for the VUV range was designed and built. The instrument was subsequently used in two beamtimes at the FLASH. The aim of the experiments was to study the laser activity of atomic transitions in xenon and krypton after inner-shell excitation with FEL pulses. The instrument performed excellently, achieving a very high resolution which will enable better determination of the properties of both the FEL and the atomic lasers under study.