Mutual neutralisation in H⁺-H^-collisions

Switching classical trajectory Monte Carlo method to describe two-active-electron collisions

“…Moreover, we show in Fig. 4 that the switch suitably describes on the electronic energy scale the process of direct [40]. The improvement related to switching is gauged by the comparison with the cross section resulting from 3b-IPM-CTMC calculations.…”

“…H + + H − collisions have been studied extensively, from both the experimental [39][40][41][42][43][44] and theoretical [30,31,[45][46][47][48][49][50][51][52] sides. In this respect, the main challenges of a classical description are to describe a stable two-electron target anion and to correctly represent the mutual neutralization process,…”

Double-Electron Transfer inH−+H+Collisions

“…The simplest analogous four-body collision system, H H ÿ , is exceedingly more complicated since (a) the outer electron is only bound if the inner electron is in its ground state, so that if both electrons transfer they must remain highly correlated during the collision, (b) at molecular distances the ion-pair interaction branches into a multitude of adiabatic states of H 2 , including bound, dissociative and autoionizing configurations. It comes as no surprise that the two-electron transfer constitutes merely a small fraction (1%) of the total reaction cross section, the latter being dominated by detachment [5] and mutual neutralization [6]. Because of the coupling of an enormous number of levels one would expect structureless cross sections as a function of velocity.…”

Double charge transfer in low-energyH++H−collisions

“…The cross section for associative ionization is about 2 orders of magnitude smaller than that for DCT. Thus, our model predicts a cross section for DCT that is larger than the expected 1%-2% [4,16,17] of the total-reaction cross section at low energies.…”

“…There is a general view that in collisions between H + and H − the cross section for DCT constitutes only a small fraction of the total-reaction cross section [4,16,17]. Here we wish to compare the cross sections for different processes competing with DCT.…”