H.-J. Kluge

TL;DR: In this paper, a new cooling technique for heavy ions stored in a Penning trap was developed, where axial and cyclotron motions were cooled by buffer gas collisions, and the outward radial diffusion caused by the buffer gas was counteracted by an azimuthal quadrupole rf field.

TL;DR: In this paper, the motion of an ion in a Penning trap has been investigated in the presence of an azimuthal quadrupole radio frequency field and a damping force provided by buffer gas collisions.

TL;DR: An experimental value for the g factor of the electron bound in hydrogenlike oxygen is found to be g(expt)=2.000 047 025 4 (15)(44), which represents a stringent test of bound-state quantum electrodynamics to a 0.25% level.

TL;DR: The nuclear charge radius of 11Li has been determined for the first time by high-precision laser spectroscopy and a combination of halo neutron correlation and intrinsic core excitation best reproduces the experimental results.

TL;DR: In this paper, a detailed study of the accuracy of the Penning trap mass spectrometer ISOLTRAP all expected sources of uncertainty were investigated with respect to their contributions to the uncertainty of the final result.