Rotational cooling of heteronuclear molecular ions with Σ 1 , Σ 2 , Σ 3 , and Π 2 electronic ground states

摘要: The translational motion of molecular ions can be effectively cooled sympathetically to temperatures below 100 mK in ion traps through Coulomb interactions with laser-cooled atomic ions. rovibrational degrees freedom, however, are expected largely unaffected during cooling. We have previously proposed schemes for cooling the internal freedom such translationally cold but internally hot heteronuclear diatomic simplest case {sup 1}{sigma} electronic ground-state molecules. Here we present a significant simplification these and make generalization most frequently encountered ground states ions: 1}{sigma}, 2}{sigma}, 3}{sigma}, 2}{pi}. relying on one or two laser-driven transitions possible inclusion tailored incoherent far-infrared radiation field.