Low-Energy (1- to 100-eV) Charge-Transfer Cross-Section Measurements for Noble-Gas-Ion Collisions with Gases

Theoretical study of the reactions of Ar++H2 and Ar++HD using the trajectory surface hopping method

“…Except very near threshold our results for both Ar ϩ ϩH 2 and Ar ϩ ϩHD are nearly constant at 60 Å 2 whereas Chapman's values are somewhat smaller. Experimental values for the charge transfer cross sections [1][2][3]7,33,34 are much smaller than our values. This is not surprising, because it is now well known 35 that charge transfer at energies below Eϭ100 eV for a system like Ar ϩ ϩH 2 is primarily determined by the vibronic energy levels and Frank-Condon factors between the reactants and products and can only be properly calculated by treating the electronic and vibrational degrees of freedom quantum mechanically.…”

Charge Exchange Cross Sections for Noble Gas Ions and N2 between 0.2 and 5.0 keV

“…(c) Total charge exchange cross sections for Ar + and N 2 . The measurements shown: black circles (present work, MGC), inverted triangles [24], squares [25], diamonds [18], × [26]. (d) Total charge exchange cross sections for Kr + and N 2 .…”

“…Ar + +N 2 collisions have been studied from 0.01 to 100 keV by several groups [18,[24][25][26]. The earliest work by [26] measured the energy distribution of both the charged and neutral component of the transmitted ion beam, and inferred the dominant reaction channel at low energy was Ar + + N 2 (v = 0) → Ar + N + 2 (v = 1) + 0.093 eV. At higher energies, [24] suggests that the large number of near-resonant reaction channels leads to a relatively flat cross section as a function of energy.…”

Stability and delayed fragmentation of highly charged C60 trapped in a conic-electrode electrostatic ion resonator (ConeTrap)

“…Furthermore, for resonant collisions of small kinetic energy for symmetric systems such as Ar + -Ar, the cross-sections can be estimated by the semi-empiric law as a function of the projectile kinetic energy E k (in eV) : r 1/2 = A À Bln(E k ). For Ar + -Ar, the A and B coefficients have been estimated to 6.9 · 10 À8 cm and 0.25 · 10 À8 cm, respectively [24]. Assuming that in the considered energy range r is a slowly varying function of the velocity, Eq.…”