Abstract
We discuss the dynamics of a polar molecule simultaneously affected by a highly intensive microwave field and by the random perturbation due to collisions with the atoms of a buffer gas. The condition of quantum chaos is assumed to be satisfied for the molecule. It is shown that under the influence of the collisions the system relaxes into the specific steady-state regime which in some sense can be referred to as a ‘‘chaotic steady-state regime.’’ The theoretical study is supported by a numerical simulation using the system parameter values corresponding to a heavy diatomic molecule.