Bound electron g-factor measurement by double-resonance spectroscopy on a fine-structure transition

摘要

Abstract: Precise determination of bound-electron g-factors in highly charged ions provides stringent tests for state of thenart theoretical calculations. The scope reaches from relativistic electron-correlation effects on the one hand to bound-statenQED terms on the other. Besides, the investigation can contribute to the determination of the fine-structure constant a.Inna first approach with boron-like ions of spinless nuclei (e.g.,n40Arn13+ and 40Ca15+), we will excite the 22P1/2 –22P3/2 fine-nstructure transition with laser radiation and probe microwave transitions between Zeeman sublevels. From this laser-micro-nwave double-resonance technique the g-factor can be determined on a ppb level of accuracy. We have prepared a cryo-ngenic trap assembly with a creation trap and a spectroscopy trap—a half-open compensated cylindrical Penning trap.nArgon gas will be injected through a remotely controlled valve, working at cryogenic temperature and in the field of ansuperconducting magnet. Ions are produced by electron impact ionization and transferred to the spectroscopy trap. In thenfuture, the trap will be connected to the HITRAP facility at GSI, and the method will be applied to hyperfine-structurentransitions of hydrogen-like heavy ions to measure electronic and nuclear magnetic moments. We present important techni-nques employed in the experiment.