The European Physical Journal D (EPJ D)

Open Access

Editorial

Topical issue: precision physics of simple atomic systems

Krzysztof Pachucki, Thomas Udem, Wim Ubachs, Paolo Crivelli and Stefan Ulmer

Published online: 22 June 2023

DOI: 10.1140/epjd/s10053-023-00702-9

Open Access

BASE—high-precision comparisons of the fundamental properties of protons and antiprotons

B. M. Latacz, B. P. Arndt, B. B. Bauer, J. A. Devlin, S. R. Erlewein, M. Fleck, J. I. Jäger, M. Schiffelholz, G. Umbrazunas, E. J. Wursten et al. (16 more)

Published online: 05 June 2023

DOI: 10.1140/epjd/s10053-023-00672-y

Open Access

Toward XUV frequency comb spectroscopy of the 1 S–2 S transition in

Jorge Moreno, Fabian Schmid, Johannes Weitenberg, Savely G. Karshenboim, Theodor W. Hänsch, Thomas Udem and Akira Ozawa

Published online: 24 April 2023

DOI: 10.1140/epjd/s10053-023-00645-1

Open Access

Update of Muonium 1S–2S transition frequency

Irene Cortinovis, Ben Ohayon, Lucas de Sousa Borges, Gianluca Janka, Artem Golovizin, Nikita Zhadnov and Paolo Crivelli

Published online: 19 April 2023

DOI: 10.1140/epjd/s10053-023-00639-z

Open Access

GRASIAN: towards the first demonstration of gravitational quantum states of atoms with a cryogenic hydrogen beam

Carina Killian, Zakary Burkley, Philipp Blumer, Paolo Crivelli, Fredrik P. Gustafsson, Otto Hanski, Amit Nanda, François Nez, Valery Nesvizhevsky, Serge Reynaud et al. (5 more)

Published online: 29 March 2023

DOI: 10.1140/epjd/s10053-023-00634-4