Excitation of Electronic States of Ar, , and by Positron Impact
Physical Review Letters, 2001•APS
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 (Δ E∼ 25 meV FWHM)
beam of positrons from a Penning-Malmberg trap. We present cross sections for the
excitation of the low-lying levels of Ar, H 2, and N 2 for incident positron energies between
threshold and 30 eV. For Ar and H 2, comparison can be made with theoretical calculations,
and, in the case of H 2, the results resolve a significant discrepancy between the only two …
electronic states of an atom or molecule using a high resolution (Δ E∼ 25 meV FWHM)
beam of positrons from a Penning-Malmberg trap. We present cross sections for the
excitation of the low-lying levels of Ar, H 2, and N 2 for incident positron energies between
threshold and 30 eV. For Ar and H 2, comparison can be made with theoretical calculations,
and, in the case of H 2, the results resolve a significant discrepancy between the only two …
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 (Δ E∼ 25 meV FWHM) beam of positrons from a Penning-Malmberg trap. We present cross sections for the excitation of the low-lying levels of Ar, H 2, and N 2 for incident positron energies between threshold and 30 eV. For Ar and H 2, comparison can be made with theoretical calculations, and, in the case of H 2, the results resolve a significant discrepancy between the only two available calculations.
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