Absolute cross sections for the production of positive atomic ions from dissociative collisions of H3+,

Absolute differential and total cross sections for neutral fragments from dissociative collisions of triatomic hydrogen like ions on He

“…Such structures in the angular distribution for the neutral fragments formation may be caused by interference between two different transitions involved in the dissociation mechanism. Similar structures were observed in previous measurements in this laboratory [12,13] distributions were measured on both sides of the forward direction to ensure symmetrical behaviour. The absolute DCSs in figure 5 for the three molecular ions exhibit the same monotonic decreasing behaviour with increasing angle.…”

“…Differences in the above-mentioned ratio as seen in table 1 can be attributed to possible differences in the vibrational population of the initial ions produced during this work and our previous work on the ion cross section measurements on He [13,15].…”

“…However, it is possible to attempt a correlation between our previously measured total ion cross sections resulting from the collisional destruction of H + 3 , D + 3 and HD + 2 on He [13,15] and the present neutral total cross sections resulting from the same collisional processes. Since reactions (3) and (4) yield as many ions as neutrals while reaction (5) yields half the number of ions as neutrals, it is therefore possible to assume the following equalities:…”

“…In table 1 are listed the values for total ion cross section [13,15] and our present results for total neutral cross section at equal energies, together with the ratio σ total (ions) σ total (neutrals) . The ratio is consistently between 0.5 and 1.0 as expected within our present energy range.…”

“…The purpose of this paper is to present measurements of absolute differential and total cross sections resulting from the collisional destruction of the above-mentioned triatomic molecular ions upon collisions with He. This work has been focused on the measurements of cross sections for total neutral fragments production in the energy range of 0.42-1.66 keV amu −1 in order to complement our previous measurements for specific dissociative channels, resulting mainly in ionic species [12,13] as well as to add to our understanding of the collisional dissociative processes. Also we report absolute angular distributions and total cross sections at the same E/M .…”