2017 Impact factor 1.947
Special Topics

EPJ D Colloquium - Experimental progress in positronium laser physics

The field of experimental positronium physics has advanced significantly in the last few decades, with new areas of research driven by the development of techniques for trapping and manipulating positrons using Surko-type buffer gas traps. Large numbers of positrons (typically ≥106) accumulated in such a device may be ejected all at once, so as to generate an intense pulse.

Standard bunching techniques can produce pulses with ns (mm) temporal (spatial) beam profiles. These pulses can be converted into a dilute Ps gas in vacuum with densities on the order of 107 cm−3 which can be probed by standard ns pulsed laser systems. This allows for the efficient production of excited Ps states, including long-lived Rydberg states, which in turn facilitates numerous experimental programs, such as precision optical and microwave spectroscopy of Ps, the application of Stark deceleration methods to guide, decelerate and focus Rydberg Ps beams, and studies of the interactions of such beams with other atomic and molecular species. These methods are also applicable to antihydrogen production and spectroscopic studies of energy levels and resonances in positronium ions and molecules.

In this substantial Colloquium paper, David Cassidy (University College London) has prepared a comprehensive summary of recent progress in this area, providing a detailed overview of the field as it stands, and a brief discussion of some future research directions.

Managing Editors
Anne Ruimy (EDP Sciences) and Sabine Lehr (Springer-Verlag)
Dear Sabine, Sandrine, and Nicolas, your professional and efficient management supported our editing tasks enormously and made the whole process smooth and pleasant. The web-based SAGA system was very helpful for handling the workflow. Thank you all for your high commitment!

Jan Freund, ICBM, University of Oldenburg, Germany

ISSN: 1951-6355 (Print Edition)
ISSN: 1951-6401 (Electronic Edition)

© EDP Sciences and Springer-Verlag