  Tunneling of electrons through a barrier with complex potential is
investigated. We focus on two cases, symmetric double rectangular barrier and
double delta potential barrier, and give expressions for resonant transmission
probability for both cases. Expressions for reflection amplitude and absorption
are also obtained in the case of delta potential. It will be shown that for
given dimensions of the potential barrier and the real part of the potential,
resonant transmission probability approaches infinity for only one positive
value of the imaginary part of the potential.
