Journal: The European Physical Journal D

Abbreviation

Eur. Phys. J. D

Publisher

Springer

Journal Volumes

ISSN

1434-6060
1434-6079

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Publications1 - 10 of 28
  • Topical issue: precision physics of simple atomic systems
    Item type: Other Journal Item
    Pachucki, Krzysztof; Udem, Thomas; Ubachs, Wim; et al. (2023)
    The European Physical Journal D
  • Towards a test of string theory using Rydberg atoms
    Item type: Journal Article
    Connerade, J. P.; Hogan, S. D.; Liu, H. P.; et al. (2008)
    The European Physical Journal D
  • Measurement of the principal quantum number distribution in a beam of antihydrogen atoms
    Item type: Journal Article
    Kolbinger, Bernadette; Radics, Balint; et al. (2021)
    The European Physical Journal D
    The ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) collaboration plans to measure the ground-state hyperfine splitting of antihydrogen in a beam at the CERN Antiproton Decelerator with initial relative precision of 10−6 or better, to test the fundamental CPT (combination of charge conjugation, parity transformation and time reversal) symmetry between matter and antimatter. This challenging goal requires a polarised antihydrogen beam with a sufficient number of antihydrogen atoms in the ground state. The first measurement of the quantum state distribution of antihydrogen atoms in a low magnetic field environment of a few mT is described. Furthermore, the data-driven machine learning analysis to identify antihydrogen events is discussed.
  • Precision physics of simple atomic systems: insights from PSAS 2024
    Item type: Other Journal Item
    Crivelli, Paolo; Karshenboim, Savely; Kienzler, Daniel; et al. (2025)
    The European Physical Journal D
  • Electron-initiated chemistry at the ambient water/air interface
    Item type: Journal Article
    Pritchard, Faith G.; Habiger, Dominik; Metting van Rijn, Marnik; et al. (2025)
    The European Physical Journal D
    The interaction of molecules with slow electrons can lead to profound chemical changes. So far, experimental probing of such interactions has been possible only with target systems in vacuum or in high energy environments where a range of processes and by-products can interfere with the electron-induced processes (e.g. in plasmas). Here, we demonstrate a method to cleanly deposit low-energy electrons onto an ambient water–air interface, with sufficient efficiency that its chemistry might be measured. Electrons are produced via the photoelectric effect at a photocathode and are driven onto an ambient water–air surface, to an anode. In traditional dissociation attachment experiments, high energy (> 10's eV) electrons excite water and oxygen molecules, leading to the detachment of secondary electrons. Monte Carlo simulations with homogeneous fields reveal that even with voltages tenfold of those used here, electrons > 2 eV are highly unlikely. This regime is similar to that of secondary electrons in traditional dissociative attachment experiments, which are those responsible for the observed electron-initiated chemistry. We follow the electron-initiated chemistry over time with a terephthalic acid dosimeter, which allows us to detect the presence of reactive products (OH•, e(aq)–) using in-situ fluorescence spectroscopy.
  • Two-photon optical Ramsey-Doppler spectroscopy of positronium and muonium
    Item type: Journal Article
    Javary, Evans; Thorpe-Woods, Edward; Cortinovis, Irene; et al. (2025)
    The European Physical Journal D
    Positronium and muonium, as purely leptonic atoms without internal structure, provide ideal systems for high-precision tests of quantum electrodynamics (QED) and measurements of fundamental constants. However, the high velocities of these lightweight atoms complicate precision spectroscopy, particularly in the 1 S-2 S transition, due to transit time broadening and second-order Doppler shifts. To overcome these challenges, we propose a novel method combining two-photon Ramsey spectroscopy with a technique to correct the second-order Doppler shifts on an atom-by-atom basis. Additionally, this approach suppresses systematic effects of the AC Stark shift to a negligible level compared to the target precision. Simulations predict that for both positronium and muonium, this method could improve the measurement precision of the 1 S-2 S transition by more than two orders of magnitude compared to the current state of the art. This approach opens up new avenues for rigorous bound state QED tests and searches for physics beyond the standard model.
  • Velocity-selected magnetic guiding of Zeeman-decelerated hydrogen atoms
    Item type: Journal Article
    Dulitz, Katrin; Softley, Timothy P. (2016)
    The European Physical Journal D
  • Measurement of a false electric dipole moment signal from 199Hg atoms exposed to an inhomogeneous magnetic field
    Item type: Journal Article
    Afach, S.; Baker, C.A.; Ban, G.; et al. (2015)
    The European Physical Journal D
  • Measurement of the three-dimensional velocity distribution of Stark-decelerated Rydberg atoms
    Item type: Conference Paper
    Vliegen, E.; Limacher, P.; Merkt, Frédéric (2006)
    The European Physical Journal D
  • Ionization cross-sections for positron collisions with N2
    Item type: Journal Article
    Cooke, David A.; Murtagh, Daniel J.; Laricchia, Gaetana (2014)
    The European Physical Journal D
    The total and direct ionization cross-sections for positron impact on molecular nitrogen have been measured in the energy range from 5 eV to 850 eV. The results are compared with other experimental and theoretical determinations.
Publications1 - 10 of 28