Ionization and positronium formation in noble gases

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چکیده

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Ionization and positronium formation in noble gases

Absolute measurements are presented for the positron-impact cross sections for direct ionization and positronium formation of noble gas atoms in the range of energies from threshold to 90 eV. The experiment uses a cold, trap-based positron beam and the technique of studying positron scattering in a strong magnetic field. The current data show generally good, quantitative agreement with previous...

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Positronium formation from valence and inner shells in noble gas atoms

When recent experimental positronium (Ps) formation cross sections in noble gases have been compared with the most up-to date theoretical studies, the agreement is qualitative, but not quantitative. In this paper we re-examine this process and show that at low energies Ps formation must be treated nonperturbatively. We also look at Ps formation with inner shell electrons.

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ژورنال

عنوان ژورنال: Physical Review A

سال: 2005

ISSN: 1050-2947,1094-1622

DOI: 10.1103/physreva.71.022701