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EPJD Topical Issue - Precision Physics of Simple Atomic Systems – 2024

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Published on 02 September 2025

Topical Issue (TI), “Precision Physics of Simple Atomic Systems”, edited by Paolo Crivelli, Daniel Kienzler, Fabian Schmid, Savely Karshenboim and Vladimir Shabaev.

We are happy to present through this collection, a valuable snapshot of current trends in the precision physics of simple atomic systems and will serve as a reference for researchers exploring fundamental interactions, antimatter, and quantum structure at the highest level of precision.

Simple atomic systems such as hydrogen, positronium, and muonium — as well as light ions and antiprotons — provide clean environments for testing bound state quantum electrodynamics (QED), determining fundamental constants, and probing physics beyond the Standard Model. Advancing in high-precision studies in atomic, molecular, and exotic systems as tools to explore fundamental physics, has been, since 2000, the focus of the PSAS series (launched in 2000 in Castiglione della Pescaia).

This EPJD Topical Collection features 12 peer-reviewed articles based on contributions to the 12th International Conference on Precision Physics of Simple Atomic Systems (PSAS 2024), held in Zurich, Switzerland, from June 10 to 14, 2024 (this edition continued the mission of by PSAS series, fostering collaboration across experimental and theoretical frontiers).

The articles in this collection represent a diverse sample of the scientific highlights from PSAS 2024, covering both established research programs and novel developments. Topics include :

  • High-resolution spectroscopy of hydrogen and exotic atoms
  • Precision measurements of muonium and muonic helium hyperfine structures
  • Cold sources and detection methods for atomic hydrogen
  • Theoretical studies of QED effects in bound states and quantum cyclotron levels
  • Investigations of antideuterium production and the electric charge neutrality of neutrons
  • Two-photon spectroscopy of positronium and muonium
  • New methodologies in data analysis and consistency treatment

All articles are available here and are freely accessible until November 5, 2025. For further information read the Editorial.

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This was our first experience of publishing with EPJ Web of Conferences. We contacted the publisher in the middle of September, just one month prior to the Conference, but everything went through smoothly. We have had published MNPS Proceedings with different publishers in the past, and would like to tell that the EPJ Web of Conferences team was probably the best, very quick, helpful and interactive. Typically, we were getting responses from EPJ Web of Conferences team within less than an hour and have had help at every production stage.
We are very thankful to Solange Guenot, Web of Conferences Publishing Editor, and Isabelle Houlbert, Web of Conferences Production Editor, for their support. These ladies are top-level professionals, who made a great contribution to the success of this issue. We are fully satisfied with the publication of the Conference Proceedings and are looking forward to further cooperation. The publication was very fast, easy and of high quality. My colleagues and I strongly recommend EPJ Web of Conferences to anyone, who is interested in quick high-quality publication of conference proceedings.

On behalf of the Organizing and Program Committees and Editorial Team of MNPS-2019, Dr. Alexey B. Nadykto, Moscow State Technological University “STANKIN”, Moscow, Russia. EPJ Web of Conferences vol. 224 (2019)

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ISSN: 2100-014X (Electronic Edition)

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