Electron Stripping Cross Sections Research Articles

Calculation of the electron-stripping cross sections of Ne charged ions by proton impact.

Electron-stripping (or ionization) cross sections of charged ions by energetic proton impact are calculated. We use the binary-encounter-approximation model to describe collisions between an incident proton and electrons in a target ion and the Roothaan-Hartree-Fock method to obtain the electron-velocity distributions of the target ion. Results calculated for Ne ions are discussed and compared with experiments and other calculations in some cases.

Electron stripping cross section from multiply charged ions by neutral atoms

Electron stripping cross sections for energetic highly charged C and Ne ions are calculated using the method based on the binary encounter approximation. Electrons of the ion are considered to be stripped by collision with the target nucleus, i.e. the electron screening is ignored. The cross section is written in terms of relative velocity between each electron and the target nucleus. The velocity distribution of electrons of the ions is obtained by the Thomas-Fermi statistical model for the purpose of obtaining the general behavior of projectile and target atomic number dependences. The effect of shell-structure on the cross section is taken into account by considering the average binding energies of electrons that are supposed to exist in each shell.

Systematics of electron-stripping cross sections for fast hydrogenic ions penetrating solids

Asymptotic (high-energy) Born approximation calculations are used as a basis for examining the systematics of electron-stripping cross sections for one-electron ions penetrating solids. Cross-section dependence on projectile velocity and atomic number are considered, as well as the dependence on the target atomic number. The calculations are based on atomic models for the solid constituents, and the results are used for an extensive comparison with experimental data for fast ions passing through thin foils.

Determination of electron-loss cross sections for negative hydrogen ions in gases using polarized projectiles

A method for the determination of the cross-section ratioσ−10/(σ−11+ (σ−10) for hydrogen ions in gases is described; the indices refer to the initial and final charge state. The method is based on the fact that a polarized hydrogen ion beam loses a certain amount of its initial polarization during charge exchange from the negative to positive state in the stripper canal of a tandem accelerator. Combined with the beam-attenuation method the individual electron-stripping cross sections (σ−11, (σ−10 and (σ−01 can be obtained.

Electron-transfer and dissociation cross sections of 1.25- to 25-keVH+,H0,H−, andH2+in collisions with Xe

Total collision cross-section measurements of 1.25- to 25-keV H/sup +/, H/sup 0/, H/sup -/ and H/sub 2/ /sup +/ in Xe are reported for the nine processes H/sup +/ arrow-right-left H/sup 0/, H/sup +/ arrow-right-left H/sup -/, H/sup 0/ arrow-right-left H/sup -/, and H/sub 2/ /sup +/ ..-->.. (H/sup +/, H/sup -/, (H/sub 2/ /sup 0/ and H/sup 0/)). Single and double electron-stripping cross sections for which the Xe atom does not change charge are deduced by combining present and past results. Comparisons are made with available experimental data and with theoretical values. (AIP)

Cross sections for stripping and electron attachment of hydrogen atoms in the metastable state and ground state in collision with hydrogen iodide

Collisions of ground state (1S) and metastable (2S) H atoms in an HI target have been studied in the energy range 0.5–3.0 keV. The total cross section for collisional destruction of H(2S) in HI is found to be about 3×10 −15 cm 2 in this energy range. For an acceptance half-angle of 10 mrad, the electron attachment and stripping cross sections of both H(1S) and H(2S) have been measured. The ratio of the electron stripping cross section for H(2S) relative to H(1S) is found to be large at low energy. Thus HI could serve as a selective charge-exchange medium for the production of polarized protons in sources of the Lamb-shift type.