Abstract
The Thomas-Fermi (TF) atom in an external homogeneous electric field has been discussed. We introduce the appropriate TF equation and the boundary conditions. The TF equation for this problem has no spherical symmetry. We approximate the partial differential TF equation by the set of simple ordinary differential equations. Our approximation is valid for ``very large'' electric field values (much larger than those for which the perturbation theory is justified). We found the TF solutions for various values of the electric field and various numbers of bounded electrons. The external electric field ionizes and polarizes the atom. We have shown that ionization of a multielectron atom is substantial even when the external field is significantly smaller than the atomic one.
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