



01547nas a2200157   4500008004100000245009000041210006900131260001500200300001100215490000700226520105100233100002601284700001901310700002301329856003701352       2009                        eng d00aMulti-channel modelling of the formation of vibrationally cold polar KRb  molecules
0 aMultichannel modelling of the formation of vibrationally cold po  c2009/05/14  a0550430 v113 a  We describe the theoretical advances that influenced the experimental
creation of vibrationally and translationally cold polar $^{40}$K$^{87}$Rb
molecules \cite{nphys08,science08}. Cold molecules were created from
very-weakly bound molecules formed by magnetic field sweeps near a Feshbach
resonance in collisions of ultra-cold $^{40}$K and $^{87}$Rb atoms. Our
analysis include the multi-channel bound-state calculations of the hyperfine
and Zeeman mixed X$^1\Sigma^+$ and a$^3\Sigma^+$ vibrational levels. We find
excellent agreement with the hyperfine structure observed in experimental data.
In addition, we studied the spin-orbit mixing in the intermediate state of the
Raman transition. This allowed us to investigate its effect on the
vibrationally-averaged transition dipole moment to the lowest ro-vibrational
level of the X$^1\Sigma^+$ state. Finally, we obtained an estimate of the
polarizability of the initial and final ro-vibrational states of the Raman
transition near frequencies relevant for optical trapping of the molecules.
1 aKotochigova, Svetlana1 aTiesinga, Eite1 aJulienne, Paul, S.  uhttp://arxiv.org/abs/0901.1486v1