Blackbody-radiation-assisted molecular laser cooling

Details Blackbody-radiation-assisted molecular laser cooling Blackbody-radiation-assisted molecular laser cooling

2002-06-19

arxiv.org/abs/quant-ph/0206132v1

Phys. Rev. Lett. 89, 173003 (2002)

Physics

Quantum Physics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.89.173003

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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