Abstract
We investigate the evolution of the rovibrational spectrum of heteronuclear diatomic molecules exposed to a strong static electric field. The field induces avoided crossings causing a strong mixing of the electrically dressed rovibrational states. At the avoided crossing the molecular configuration is a strongly distorted and asymmetric one showing well-pronounced localization effects of the corresponding probability densities. The potential impact of our findings on the state-selective chemical reaction dynamics is discussed.