Quantal and Semiclassical Methods of Slow Ion  Scattering with Applications to NEON(4+) + Helium.
Abstract
The dynamics of lowenergy ionatom collisions is investigated at a twostate level of approximation. We have proposed a new semiclassical method based upon the twolevel theory in spinor representation. The new approach presents a more transparent picture of the present ion atom scattering for the chargetransfer process. The new results for the transition probability of the system Ne ^{4+} +He compare very well with existing full quantum mechanical methods. Particularly, we give a new view of the Smatrix as a rotation operator which serves to rotate the scattering state. Finally, the single chargetransfer differential crosssections (sigma(theta)) are calculated at laboratory impact energies from 220 eV to 500 eV for the same system (Ne^{4+} + He) and are compared with the recent experimental data of Tunnell et al. Our calculations explain the experimental data both in quality and quantity. The model scattering potential is used in the sigma(theta) calculation and its construction is discussed.
 Publication:

Ph.D. Thesis
 Pub Date:
 December 1987
 Bibcode:
 1987PhDT........51T
 Keywords:

 Physics: Atomic