The energy distribution cross section in threshold electron-atom impact ionization

Theoretical electron-impact-ionization cross section for Fe11+ forming Fe12+

We have calculated cross sections for electron impact ionization (EII) of P-like Fe11+ forming Si-like Fe12+. We have used the flexible atomic code (FAC) and a distorted-wave (DW) approximation. Particular attention has been paid to the ionization through the 3l → nl′ and 2l → nl′ excitation autoionization (EA) channels. We compare our results to previously published FAC DW results and recent e...

Absolute Electron Impact Ionization Cross

Normalized values of cross sections for the production of ions by electron impact on N20 and NO have been obtained by utilizing the relative flow technique. The accurately known values of cross sections for the production of singly charged ions of rare gases from the parent atoms have been used for the normalization. Cross sections for the generation of fragment ions have been measured for the ...

Spurious Electrons in Electron Spectrometers and their Effect on Differential Electron Impact Ionization Cross-Section Measurements

Universal shape function for the double ionization cross section of negative ions by electron impact

It is shown that recently measured cross sections for double ionization of negative ions (H−, O−, and C−) possess a universal shape when plotted in suitable dimensionless units. The shape can be represented with a simple analytical function, following the same principles as it has been done in establishing a universal shape function for single ionization [Rost and Pattard 1997 Phys. Rev. A 55 R...

Electron-impact double ionization of a model helium atom

Singleand double-ionization processes in electron scattering from a model helium atom are calculated by a direct solution of the time-dependent Schrödinger equation on a 3D lattice. The Coulomb interaction between the electrons is described by v(r1 ,r2)51/r. and all angular momenta are set to zero. The initial state is a product of the ground state of the model helium atom on a 2D lattice with ...