Double ionization of He and Li by 95-MeV/amu <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">N</mi></mrow><mrow><mn>7</mn><mo>+</mo></mrow></msup></mrow></math></span> impact

B. Skogvall; J. Y. Chesnel; F. Fremont; D. Lecler; X. Husson; A. Lepoutre; D. Hennecart; J. P. Grandin; B. Sulik; A. Salin; N. Stolterfoht

doi:10.1103/PhysRevA.51.R4321

Rapid Communication

Double ionization of He and Li by 95-MeV/amu $N^{7 +}$ impact

B. Skogvall, J. Y. Chesnel, F. Fremont, D. Lecler, X. Husson, A. Lepoutre, D. Hennecart, J. P. Grandin, B. Sulik, A. Salin, and N. Stolterfoht

Phys. Rev. A 51, R4321(R) – Published 1 June 1995

Abstract

The cross-section ratio for double-to-single ionization has been investigated for collisions of 95-MeV/amu $N^{7 +}$ with He and Li target atoms. The measured values for Li and He are equal within the experimental uncertainties. First-order perturbation theory suggests that double ionization of Li is dominated by electron-nuclear interaction, whereas double ionization of He is dominated by electron-electron interactions such as shake-off and initial-state correlation. First-order perturbation theory can describe the ratio of double to single ionization of $N^{7 +}$ +Li at 95 MeV/amu within the experimental uncertainties.