Ionization of ammonia by electron impact at 25–1000eV

Optical emission in the dissociation of ammonia by low energy He+ ions

“…The low-energy ends of the excitation functions resemble those presented in [21] for e − + NH 3 , where for both excited states, NH + (B 2 Δ) and NH + (C 2 Σ − ), a maximum of σ * is reached at about 70 eV. Excitation functions with a distinct maximum at 70 eV have been observed also in the experimental studies of NH + 2 and NH + production in the dissociative ionization of ammonia by electron impact [62,63]. For higher collision energies, the NH + * (B, C) cross sections decrease in [21], while in the present work for ND + * (B, C) they increase (see Fig.…”

Total-cross-section measurements for electron scattering byNH3,SiH4Zecca1, Karwasz2, Brusa3 1992Phys. Rev. A968492View full textAdd to dashboardCite

“…SEP1, a model using an energy-independent polarization potential; SEP2, an energydependent polarization potential).Absolute-ionization cross sections have been measuredfor CH4 by Rapp and Englander-Golden[49] up to 1000 eV, by Schram et al[50] up to 12 keV for CH~, and by Schutten et al[51] up to 20 keV for H20. NH3 ionization cross sections were measured by Crowe and McConkey[52] and by Bederski, Wojcik, and Adamczyk[53].Both measurements are normalized to the theoretical values of Khare and Meath…”

Mass Spectrometric Study of Positive Ion-Molecule Reactions in the C3H6and Ar Mixtures Inside the High Pressure Ion Source

“…For all remaining observed ions relative ion currents increase as the propene concentration in the mixture with the argon increase. The C 3 H + 3 ions come from reactions (4), (6) and (8) (5), (13), (15)(17) and (22 (7), (12), (18), (19) and (23). The C 3 H + 6 ions come from the charge-exchange reaction with argon (reaction (9)), mainly.…”

“…Computer program permits work in three modes: analog, tabular and peak selector. For the ions of higher mass number m/q, a transmission loss (mass discrimination) must be taken into account [23]. In order to correct the errors resulting from ion discrimination eects in dierent regions of the mass spectrometer, the ion transmission coecient on the ion path from the source to the collector of an electron multiplier (which could also work as a counter) was determined [24].…”