Orientational dichroism in the (e,2e) reaction on the laser-oriented
sodium atoms

A.S. Kheifets$^\star$ and I. Bray$^\sharp$

$^\star$ Research School of Physical Sciences and
Engineering, Australian National University, Canberra A.C.T. 0200,

$^\sharp$Electronic Structure of Materials Centre, Flinders University
of South Australia, GPO Box 2100, Adelaide S.A. 5001, Australia

Triple-differential cross-section (TDCS) of the electron impact
ionization of the laser-oriented sodium atoms $3P_{3/2}$, $m_f=\pm3$
is calculated using the distorted wave 1st Born approximation
(DWBA). In contrast to earlier calculations$^{1,2}$ no account is
taken of the interelectron interaction in the two-electron
continuum. However, both the projectile and the ejected electron are
distorted by the atomic (ionic) core. Good agreement is found with
experiment at incident energies of 150 and 90~eV