Positron and Positronium Collisions

  • Gaetana Laricchia
Part of the Physics of Atoms and Molecules book series (PAMO)


During the last few years, there has been considerable experimental progress in the study of positron collisions with atoms and molecules, including near-threshold1,2 and differential studies3,4,5 of specific scattering channels as well as results for experimentally difficult (but theoretically more tractable) targets such as atomic hydrogen6,7,8 and alkali atoms9. In addition to the intrinsic interest in studying characteristic processes such as annihilation10,11,12, the investigation of collisions involving positrons can be useful for probing general collision effects, especially when compared with other projectiles which differ in mass or charge13,14. A recent development has been the production of atomic beams of monoenergetic positronium15 (Ps, the bound state of a positron and an electron) which are enabling direct measurements of total cross-sections16,17,18 and stimulating considerable theoretical activity19,20,21,22,23. Highlights of this recent progress, as well as some indication of possible future developments are presented in this brief review. The interested reader is also referred to the reviews of James Walters and Helge Knudsen in this volume.


Annihilation Rate Nucl Instr Meth Eject Electron Energy Incident Positron Energy Annihilation Probability 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1999

Authors and Affiliations

  • Gaetana Laricchia
    • 1
  1. 1.Department of Physics and AstronomyUniversity College LondonLondonUK

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