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

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.