I suspect that in a table of the Triniti database (see screenshot) it is reported the wrong molecule (Ar instead of He) or the literature reference is wrong.
The reference doi is below and they report about Helium metastable atoms and not Argon.
title = A measurement of the electron impact ionization cross section of helium atoms in metastable states
volume = 9
issn = 0022-3700
url =
https://doi.org/10.1088%2F0022-3700%2F9%2F15%2F013 doi = 10.1088/0022-3700/9/15/013
abstract = Cross sections for the ionization of metastable helium
atoms, predominantly in the 23S state, at electron energies from the
threshold to 1000 {eV} have been measured using the crossed electron and
fast atom beam technique. Corrections are made for the presence of
ground-state atoms and a very small concentration of highly excited
atoms. The semiquantal binary encounter data agree satisfactorily up to
20 {eV}, but less well at higher energies. From 200 to 1000 {eV}, the
measured data agree well with Bethe-Born cross sections of Briggs and
Kim (1971) for He(23S) provided a correction is made to take account of a
spurious contribution to the ionization signal which is only
significant at the higher energies. All the various Born cross sections,
at high energies, are substantially lower than the present measurements
and also the Bethe-Born data, but they are either comparable with or
smaller than the measured cross section at its peak.
pages = 2617--2631
number = 15
journaltitle = Journal of Physics B: Atomic and Molecular Physics
shortjournal = J. Phys. B: At. Mol. Phys.
author = Dixon, A. J. and Harrison, M. F. A. and Smith, A. C. H.
urldate = 2019-05-23
date = 1976-10
langid = english