AB INITIO EXCITATION CROSS SECTIONS FOR LOW-ENERGY H+Na,He COLLISIONS

A. K. Belyaev$^{\bullet}$, D. Egorova$^{\star}$, J. Grosser$^{\star}$, 
T. Menzel$^{\star}$

$^{\bullet}$ Department of Theoretical Physics, Pedagogical University of 
Russia, St. Petersburg, Russia \\
$^{\star}$ Institut f"ur Atom- und Molek"ulphysik, Universit"at Hannover,
Germany

The quantum mechanical treatment of the excitation processes in low-energy
collisions of hydrogen atoms with sodium and helium atoms is performed and
reported. The adiabatic potentials, the radial and the rotational
nonadiabatic couplings are calculated by the ab initio quantum chemical
method. The cross sections are obtained from numerical solutions of the
coupled channel equations, which include the electron translation effects.