High-precision laser spectroscopy of atomic hydrogen has led to an impressive accuracy in tests of bound-state quantum electrodynamics (QED). At the current level of accuracy many systematics have to be studied very carefully and only independent measurements provide the ultimate cross-check. This has been proven recently by measurements in muonic hydrogen, eventually leading to a significant shift of the CODATA recommended values of the proton charge radius and the Rydberg constant. We aim to contribute to tests of fundamental physics by measuring the 1S-2S transition in the He+ ion for the first time. Combined with measurements in muonic helium ions this can probe the value of the Rydberg constant, test higher-order QED terms, or set benchmarks for ab initio nuclear polarizability calculations. We extend the Ramsey-comb spectroscopy method to the XUV using high-harmonic generation in order to excite a single, trapped He+ ion.
|Title of host publication||Proceedings of Science PoS (FFK2019)049|
|Number of pages||10|
|Publication status||Published - 29 Oct 2019|
|Event||2019 International Conference on Precision Physics and Fundamental Physical Constants, FFK 2019 - Tihany, Hungary|
Duration: 9 Jun 2019 → 14 Jun 2019
|Conference||2019 International Conference on Precision Physics and Fundamental Physical Constants, FFK 2019|
|Period||9/06/19 → 14/06/19|