Blackbody-radiation-assisted laser cooling of molecular ions |
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Authors: | Vogelius I S Madsen L B Drewsen M |
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Institution: | Department of Physics and Astronomy, University of Aarhus, 8000 Aarhus C, Denmark. |
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Abstract: | 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. The distribution of internal rovibrational states, however, gets in thermal equilibrium with the typically much higher temperature of the environment within tens of seconds. We consider a concept for rotational cooling of such internally hot, but translationally cold, heteronuclear diatomic molecular ions. The scheme relies on a combination of optical pumping from a few specific rotational levels into a "dark state" with redistribution of rotational populations mediated by blackbody radiation. |
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