  We use the exact analytical solution of the radial part of the Klein-Gordon
equation describing a charged massive scalar field in the electrically charged
Garfinkle-Horowitz-Strominger dilaton black hole spacetime, given in terms of
the confluent Heun functions, to study the physical phenomena related to
resonant frequencies associated to this field, and also to examine some aspects
related to its Hawking radiation. The special case of a Schwarzschild spacetime
is also considered.
