Ionization Dynamics in Fast Ion-Atom Collisions. I. Energy and Angular Distributions of Low-Energy Electrons Emitted in Ionization of He by Bare Carbon Ions

Authors

• Lokesh C. Tribedi, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India
• P. Richard, J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas
• Y. D. Wang, J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas
• C. D. Lin, J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas
• L. Gulyas, Institute of Nuclear Research of the Hungarian Academy of Science (ATOMKI), P.O. Box 51, H-4001 Debrecen, Hungary
• M. Eugene Rudd, University of Nebraska - LincolnFollow

Document Type

Article

Date of this Version

11-1998

Comments

Published in Physical Review A Volume 58, Number 5, November 1998. Copyright © American Physical Society; used by permission.

Abstract

We have studied the two-center effect (TCE) in ion-atom ionization by measuring the energy and angular distributions of the double-differential cross sections (DDCSs) (d²σ/dεdΩ) of the low-energy electrons emitted in a collision of He atoms with 2.5 MeV/nucleon C⁶⁺ ions. The electrons with energies between 0.1 and 300 eV were detected for 13 different emission angles between 15° and 160°. From the measured DDCSs we have deduced the single differential cross sections such as dσ/dΩ and dσ/dε and the total cross section. The data have been compared with the continuum distorted wave eikonal initial state calculations with H-like and Hartree-Fock-Slater wave functions for the initial and final state of the electron and first Born calculations. The forward-backward asymmetry parameter also has been deduced to study the TCE in detail. In the following paper [Lokesh C. Tribedi et al., Phys. Rev. A 58, 3626 (1998)] we have explored the collision dynamics by deducing the momentum distributions of the electron, the recoil ion, and the projectile.