Cross Sections for Positive-Ion and Electron Production in Collisions of 1-25 keV Hydrogen Atoms with Atomic and Molecular Gases

Abstract

Phys. Rev. Letters~17 847 (1966). The 02 and Ne used in this work was Matheson assayed reagent grade as supplied in 1.1liter Pyrex flasks.The analyses supplied by the manufacturer showed: for 02, no detectable impurities greater than 2 ppm by volume for one sample and 15 ppm for a second sample; for Ne, no detectable impurities greater than 12 ppm for all samples. ' P. S. Hoeper, W. Franzen, and R. Gupta, Phys, Rev. 168, 50 (1968).'

Production of Positive Ions and Electrons in Collisions of 1–25-keV Protons and Hydrogen Atoms with CO, CO2, CH4, and NH3

“…5 and 6 are plotted CT+ and CT_ for HO bombardment of CO, CO2, NH3, and CH4• The positive-ion production cross section for each gas is the sum of the total electron capture cross section, CTO_I and the total ionization cross section for fast atom impacts, CTia. Examples of capture and ionization reactions are (5) and (6) The electron production cross section is the sum of the cross section for ionization processes, such as (6), and the cross section, 0'01, for the stripping reaction,…”

“…l Auroral protons occur with a broad energy range, but 1-25 keY H+ and HO with N 2 • Charge-production cross sections have also been reported for 1-25 keY HO incident on H 2 , O2, He, Ne, Ar, Kr, and Xe. 5 Target gas ionization cross sections were derived from those results and recent measurements 6 of capture and stripping cross sections. The present report extends our measurements of ()"+ and ()"_ for 1-25-keV HO projectiles to CO, CO 2 , CH4, and NH a • Charge-production cross sections for incident 1-25 keY H+ are also reported.…”

H+N2and H+O2collisions: Experimental charge-production cross se

“…Specifically, for N, targets, 'the reactions investigated are H+N, -H'+e +N, , H+ N2-H+ e + N2+, H+N2 H +N2+~( 1) (2) (3)…”

“…The N, ' formation cross section ON represents the sum of reactions (2) and (3). Finally, the total charge-production cross sections cr, End 0, ', for negative and positive charge, respectively, are the sums of all three reactions. These cross sections, which obviously must be identical, are nevertheless distingue.…”

Charge exchange collisions in the presence of competing processes: an integral equation approach

“…For comparison, a set of electron loss cross sections where the data by Roussel et al are extrapolated smoothly below 1 keV without a sharp drop, is also used in the calculation (modified high loss cross section, figure 5). The ionisation cross sections for muon and muonium are from the corresponding proton and hydrogen data by Rudd et a1 (1985) and McNeal et al (1970), respectively. For the elastic process, the calculated values of Yam (1979) for protons and hydrogen are used.…”