  The interaction between light and an atom proceeds via three paradigmatic
mechanisms: spontaneous emission, stimulated emission, and absorption. All
three are resonant processes in the sense that they require that the radiation
field be resonant with the atomic transition. The non-resonant counterparts of
these effects, while necessary to maintain locality of the interaction in
principle, are usually negligible because their effects tend to average out
over multiple cycles of the radiation field. This state of affairs does not
hold if the atom is accelerated. We show that, when accelerated, the
non-resonant effects can be made to dominate over the conventional resonant
effects. In fact we show that the non-resonant effects can be vastly enhanced
by stimulation, and that suitably chosen acceleration can entirely suppress the
resonant effects. In the class of effects that we study, the Unruh effect is
the special case of vanishing stimulation.
