Integral cross sections for ion pair and free electron production in collisions with hydrogen atoms

Associative ionization in hydrogen atom-rare gas collisions between 10 and 100 eV

“…The absolute cross section values are also based on the data of van Zyl et al [15] and Fleischmann et al [16]. However, since the range of collision energies covered by these authors does not overlap with ours, we used the curves published by Aberle et al [3] for the production of rare gas ions to bridge the energy gap between the data of van Zyl et al or Fleischmann et al and our measurements. The reference data are given in table 2.…”

“…Reference data used to obtain the absolute values of the cross sections. We used the values given by Aberle et al [3] as reference data, but his calibration is based on the experimental results of van Zyl et al [15] and Fleischmann et al [16].…”

“…Most of these data belong to the energy range above 500 eV, but only rarely are data given at lower energies, especially close to threshold. For ionization processes in collisions between hydrogen atoms and the heavier rare gases (H + X with X = Ar, Kr, Xe) experimental data are available, down to energies as low as 20 eV [3][4][5]. In this energy range the only charge production processes occurring in hydrogen-rare gas collisions with ground state atoms are ion pair formation H + X −→ H − + X + and free electron production H + X −→ H + + e − or H + X −→ X + + e − .…”