Neutralization of Fast Molecular IonsH2+andN2

Balmer line emission from low-energy impact of H+, H2+ and H3Ławicki1, Pranszke2, Kowalski3 et al. 2007Nuclear Instruments and Methods in Physics Research Section B: 8010View full textAdd to dashboardCite

“…It is now of interest to see if and to what extent the present results conform to the IPM concept outlined in the Introduction with regard to [16,18,[28][29][30]. These five experiments agree with each other in that the product distributions (Doppler width, intensity, kinetic energy) depend on the collision velocity, not the energy of the projectiles.…”

“…This corresponds to the collision energy of 10 eV per nucleon, comparable to the bond energies of the H þ 2 and H þ 3 ions. The IPM as described in [16,18,[28][29][30] is a purely phenomenological concept. It does not claim to explain the reaction mechanism in any physical detail.…”

“…As a final example of the IPM, [30] reports on H þ 2 scattering on a Ni surface. The energy distributions of the charge transfer products H and H 2 were found to peak at the same energy per nucleon (the relative intensities of the two peaks were not analysed in this case).…”

“…Of the five investigations supporting this model [16,18,[28][29][30] only [18,30] were done at less than 1 keV collision energy, although it is known that impact energies of hydrogen ions upon the tokamak walls should not exceed 500 eV [3]. Different from the earlier sub-keV optical investigations, here a tungsten target is used.…”

Scattering of Small Molecules at Surfaces

“…Under surface channeling conditions the surface is essentially not corrugated and the molecules experience no violent elastic collisions. Therefore the dissociation is dominated by electronic effects [4]. A very interesting aspect of the experiments is the finding of negative molecular ions after the interaction with the surface [5].…”