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Exact solutions of Schroedinger and Pauli equations for charged particles inan external stationary electromagnetic field of an arbitrary configuration areconstructed. Green functions of scalar and spinor particles are calculated inthis field. The corresponding equations for complex energy of particles boundedby short range potential are deduced. Boundary condition typical for delta -potential is not used in the treatment. Explicit analytical expressions aregiven for the shift and width of a quasistationary level for differentconfigurations of the external field. The critical value of electric field inwhich the idea of quasistationary level becomes meaningless is calculated. Itis shown that the common view on the stabilizing role of magnetic fieldconcerns only scalar particles.Comment: 15 pages, no figures, LaTeX2

ON INFLUENCE OF INTENSIVE STATIONARY ELECTROMAGNETIC FIELD ON THE BEHAVIOR OF FERMIONIC SYSTEMS