  We analyze the creation of fermions and bosons from the vacuum by the
exponentially decreasing in time electric field in detail. In our calculations
we use QED and follow in main the consideration of particle creation effect in
a homogeneous electric field. To this end we find complete sets of exact
solutions of the $d$-dimensional Dirac equation in the exponentially decreasing
electric field and use them to calculate all the characteristics of the effect,
in particular, the total number of created particles and the probability of a
vacuum to remain a vacuum. It should be noted that the latter quantities were
derived in the case under consideration for the first time. All possible
asymptotic regimes are discussed in detail. In addition, switching on and
switching off effects are studied.
