Mg+ beamtime at CRYRING@ESR

2021/04/10

Depending on the frequency of the repump laser, either the lower or upper hyperfine structure component of the D1-Line of 25Mg+ can be addressed by the spectroscopy-laser.

A magnesium beam time took place at CRYRING@ESR from March 22 to 31. In advance, a new laser system was commissioned (see here), allowing us to address the ions simultaneously in collinear and anti-collinear geometry. This enabled pump-and-probe experiments on the beam and we were able to demonstrate population transfer between the two ground-state hyperfine levels of ²⁵Mg⁺ (see Fig.). Optical pumping in the Zeemann substructure of the ground-state levels was also systematically investigated.

As a side result it turned out that laser spectroscopy provides an extremely sensitive tool to optimize the superposition of the electron and the ion beam in the electron cooler.