Absolute partial cross sections for electron-impact ionization of NO and NO2 from threshold to 1000 eV

Abstract

Absolute partial cross sections for electron-impact ionization of H 2 O and D 2 O from threshold to 1000 eV Absolute partial cross sections for electron-impact ionization of CH4 from threshold to 1000 eV Absolute partial cross sections for electron-impact ionization of nitric oxide and nitrogen dioxide are reported for electron energies from threshold to 1000 eV. The product ions are mass analyzed using a time-of-flight mass spectrometer and detected with a position-sensitive detector whose output demonstrates that all product ions are collected irrespective of their initial kinetic energy. Data are presented for the production of NO ϩ , N ϩ , O ϩ , and NO 2ϩ ions from NO; and for the production of NO 2 ϩ , NO ϩ , N ϩ , O ϩ , and (N 2ϩ ϩO 2ϩ ) ions from NO 2 . The overall uncertainty in the absolute cross section values is Ϯ5% for singly charged parent ions, while that for the fragment ions may be as large as Ϯ20%. For NO, the previously published data are generally in reasonable agreement with those presented here, although there remain some significant discrepancies with even the most recent work. No previous comprehensive study of NO 2 has apparently been reported but the experimental NO 2 ϩ cross section data that are available disagree substantially with the present measurements. The present total NO 2 cross section is, however, in excellent agreement with recent theoretical work.

Electron-impact ionization of CCl4 and CCl2F2

“…16 For CCl ϩ and CF 2 ϩ , none of these approaches is applicable and the aggregate cross section is reported. However, for CCl 2 F 2 , some of the product ions are formed with very nearly the same mass-to-charge ratios and cannot be separated by the time-of-flight apparatus.…”

Response of the Martian thermosphere/ionosphere to enhanced fluxes of solar soft X rays

“…In determining the densities, the electron impact ionization cross section for NO at 75 eV was assumed to be 80% of that for N 2 . Recent measurements of the N 2 and NO electron‐impact ionization cross sections by Straub et al [1996] and by Lindsay et al [2000], respectively, show that the cross sections for production of the ions N 2 + and NO + from their parent neutrals are actually comparable. The reported values for the cross sections for production of N 2 + and NO + by impact of 75 eV electrons are about 1.90 × 10 −16 and 1.94 × 10 −16 cm 2 , respectively.…”

Ionization and dissociation fractions of CO2under 10–30-keV H−, C−, and OLi1, Zhao2, Ye3 et al. 2012Phys. Rev. A

“…Recently, the ionization and dissociation dynamics of molecules and atoms have attracted growing interest [1][2][3][4][5][6][7][8][9]. The total and partial ionization cross section data are of practical importance in various field, such as, in fusion-edge plasma diagnostics; gas discharge; planetary-, stellar-, and cometary atmospheres; radiation chemistry; and mass spectrometry and in modeling radiation effects on materials including biomolecules [10].…”