Laserspektroskopie des 1s²2s²2p²P_3/2 → ²P_1/2 M1-Übergangs in sympathetisch gekühlten Ar¹³⁺-Ionen

In this thesis the spectroscopy of the 2P3/2 → 2P1/2 M1 fine-structure-transition in Ar13+-ions at 441nm was examined. Using high precision spectroscopy a verification of a possible drift in the value of the fine-structure constant alpha should be possible. The unique experimental setup enables spectroscopy of ultra-cold and hence precisely localized highly charged ions for the first time. For this purpose the production of boron-like Ar13+-ions (highly charged ions) was spatially separated from the spectroscopy which takes place in a cryogenic linear Paul trap. Here the Ar13+-ions are sympathetically cooled to the mK-range in a 9Be+-Coulomb crystal. For the spectroscopy a long-term stable, but tunable 882nm Titan:Sapphire laser having a 100 kHz linewidth is used, which after frequency-doubling covers the required range. With a Monte Carlo Simulation the necessary spectroscopy-time needed for a clear detection of spontaneous emission in a measuring range is analyzed and evaluated, whether a signal could be surmised after a six-hour measurement in order to limit further measurements of this range. The simulation predicts a signal-like background structure in 20% of the measuring ranges. Out of the seven ranges, this would affect one or two. Using these perceptions a promising measuring range was detected during the actual spectroscopy supporting a measurement from 2016/10