Ion pair formation in H, D+Ar, Kr, Xe collisions from threshold to 100 eV

Abstract

Integral cross sections are reported for ion pair formation in collisions between hydrogen (H,D) and noble-gas (Ar,Kr,Xe) atoms from threshold to 100 eV. The energy dependence of the cross sections is strongly oscillatory. A curve crossing model provides a good semi-quantitative explanation of the results.

Emission of fast hydrogen atoms at a plasma–solid interface in a low density plasma containing noble gases

“…In the second case, the emission profile coincides reasonably well with the profiles produced by fast atom ions with half of the initial kinetic energy. The results are in qualitative agreement with ion-beam experiments [46] for high Z targets. In contrast to measurements taken at higher pressures, we do not detect any significant emission caused by atomic or molecular ions moving toward the target [2], induced, for instance, by charge-exchange processes.…”

“…Excitation occurs presumably at low internuclear distances, and therefore high kinetic energies are required, as observed in the experiments [20]. The process seems to involve forming the ion pairs Ar + and H − [46]. On the other hand, the other process, namely energy or excitation transfer reaction, passes through the same chain as the excitation of hydrogen by argon atoms in the ground level:…”

Partial differential cross sections for inelastic He++Ne collisions at low energy

“…This is due to the interference between the contributions from the paths with labels 4 and 5 on the way out. The interpretation is confirmed by a good agreement of the observed oscillation frequency with the value deduced from the area between the potential curves 4 and 5 [27], and by our numerical results. The occurence of the Rosenthal oscillations implies that the observed channels must be populated from both possible paths, 4 and 5.…”

Cross sections for electron capture and loss by H+ and H impact on O and O2

“…We have found such striking behavior for H-atom impact on Ar [Van Zyl et al, 1977], N 2 and O 2 [Van Zyl et al, 1978], H 2 [Van Zyl et al, 1981], and other H atoms [Gealy and Van Zyl, 1987a], down to H energies of only 0.05 keV. But such structures persist down to even lower H energies, as nicely shown for rare-gas-atom targets by Aberle et al [1980].…”