Classical trajectory Monte Carlo (CTMC) simulation method and the four-body formalism of boundary corrected continuum intermediate state (BCCIS-4B) approximations have been employed to determine total single electron capture cross section and total single ionization cross section in collisions of H +, He2+ and Li3+ with helium atom and energy in range of 30-200 keV/amu. Present theoretical study using CTMC method is based on three-body formalism, where interaction of the active electron in target ion has been approximated by a model potential containing both long and short range part. As a consequence, initialization of the problem has been made on a multiperiodic orbit in sharp contrast to singly periodic orbit occurring in hydrogenic model. In BCCIS-4B formalism, distortion in the final channel related to Coulomb continuum states of projectile ion and active electron in the field of residual target ion are included. Results so obtained from both methods are in very good agreement with available experimental findings.
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Acknowledgments Thanks are due to Professor C R Mandal, Ja-davpur University, for helpful discussions. Present work is supported by University Grants Commission (UGC), Government of India, New Delhi through Grant No. 38-176/2009(SR).
- Cross sections
- Electron capture