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Abstract

The high-precision Penning-trap mass spectrometer PENTATRAP is able to perform massratio measurements of highly-charged ions at a relative mass uncertainty below 10⁻¹¹. Unique features of the setup are the single-ion sensitivity, the stack of five traps used for simultaneous measurements, and the external ion production that enables various ion species to be introduced to the traps. In order to achieve these low uncertainties, it is important to investigate the systematic effects on the measured mass ratio precisely.

In the first part of this thesis, characterization measurements of the Penning traps with respect to the homogeneity of the magnetic field, the harmonicity of the electrostatic potential and the temperature of the ions are investigated and performed. These characterizations are focused especially on the current ⁴He²⁺ vs. ¹²C⁶⁺ mass-ratio measurement campaign at PENTATRAP. The initial results of the measurement campaign are analyzed and discussed in the second part of this work.