In the collision of a spin-polarized electron with an atom, if is only
natural to assume that any observed difference between spin-up and sp
in-down electrons must originate from spin-dependent forces in the int
eraction. However, it has been known for sometime that, for inelastic
electron-atom scattering, a non-zero spin asymmetry can result from th
e coulomb interaction ignoring spin-dependent forces on the projectile
, In this paper, it is demonstrated that the same type of effect may b
e expected for ionization of the heavier inert gases. Theoretical resu
lts are compared with recent unpublished experimental measurements.