Different types of splitting of s,p-element AOs in a one-dimensional electronic potential, which can be represented as a series expansion phi = phi(z(0)) + A(z - z(0)) + B(z - z(0))(2) +(...), (z(0) is the nuclear coordinate), were considered. The region of orbital degeneracy is established for the ground state of the W radical-anion in the space of A and B parameters. The approach suggested can be used as a basis for determining the types and magnitudes of electric fields that are necessary for changing the AO positions (on the energy scale) in atoms and their chemical compounds, with the aim of controlling their physicochemical properties and reactivity. (C) 2002 Elsevier Science B.V. All rights reserved.