Excitation of Electronic States of Ar,, andby Positron Impact
- 25 July 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 87 (7) , 073201
- https://doi.org/10.1103/physrevlett.87.073201
Abstract
We have measured the first state-resolved, absolute cross sections for positron excitation of electronic states of an atom or molecule using a high resolution beam of positrons from a Penning-Malmberg trap. We present cross sections for the excitation of the low-lying levels of Ar, , and for incident positron energies between threshold and 30 eV. For Ar and , comparison can be made with theoretical calculations, and, in the case of , the results resolve a significant discrepancy between the only two available calculations.
Keywords
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