Atomic, Molecular, and Optical Physics Seminar
Optical Production of Ultracold Polar RbCs Molecules
Department of Physics
We demonstrate the production of a sample of ultracold RbCs molecules in their absolute vibrational ground state with a translational temperature of about 100 μK and a narrow distribution of rotational states. The molecules are initially formed from laser-cooled 85Rb and 133Cs atoms via photoassociation and are produced in excited electronic vibrational levels. A fraction of these excited molecules subsequently spontaneously decay to ground electronic states, populating many excited vibrational levels. We transfer the population of one such level to the X1Σ+(v=0) ground state by a stimulated emission pumping (SEP) technique. In order to efficiently produce these ground state molecules it was necessary to have detailed spectroscopic information about the levels to which we photoassociate the molecules, the levels to which they spontaneously decay, and the levels involved in the SEP transfer. To this end, we carry out and analyze photoassociation spectroscopy and resonance enhanced two-photon ionization spectroscopy of relevant vibrational levels of excited and ground state electronic potentials.
Tuesday, April 11, 2006
Gant Science Complex