Weiterentwicklung eines Geschwindigkeits filters zur Beobachtung ladungsändernder Prozesse hochgeladener Ionen

Resonant photoionisation- and photorecombination processes of highly charged ions had been investigated in this work. A new design of the Wien-type velocity filter in use before, has signi cantly improved the device. This was used to separate highly charged ions extracted from an electron beam ion trap depending on their q/mratio. During a beamtime at the synchrotron radiation source BESSY II, resonant photoionisation of Fe15+ was observed and measured for the rst time. The precision of this measurements allows to test and distinguish between various predictions on a hitherto unreached level. Furthermore, several new methods based on analysis of the extracted ions which were sucessfull tested during measurements of dielectronic recombination, promise further improvements in future measurements