  The Bethe-Salpeter equation for system of two oppositely charged particles
not only reproduces the Coulomb spectrum, but, for enough large coupling
constant ${\cal C}>\frac{\pi}{4}$, predicts additional levels not predicted by
the Schr\"odinger equation. These relativistic states (called abnormal), in
contrast to the normal ones, are dominated, for more than 90-99 percent, by
Fock states involving the exchange particles - the photons, whereas
contribution of two massive charged particles themselves is rather small (1-10
\%). Since the carrier of a large (positive) charge is a heavy ion, and the
negative charge is provided by electron, the masses of two constituents are
very different. It is shown that in a system with so different masses the
abnormal states still exist. Moreover, the effect of unequal masses is
attractive. The balance between photons and charged constituents is weakly
sensitive to the mass ratio, so the photons still predominate.
