  We consider the formation of RbCs by an elliptically polarized laser pulse.
By varying the ellipticity of the laser for sufficiently large laser intensity,
we see that the formation probability presents a strong dependence, especially
around ellipticity 1/ $\sqrt$ 2. We show that the analysis can be reduced to
the investigation of the long-range interaction between the two atoms. The
formation is mainly due to a small momentum shifts induced by the laser pulse.
We analyze these results using the Silberstein's expressions of the
polarizabilities, and show that the ellipticity of the field acts as a control
knob for the formation probability, allowing significant variations of the
dimer formation probability at a fixed laser intensity, especially in the
region around an ellipticity of 1/ $\sqrt$ 2.
