Photoassociation of alkali tetramers into high vibrational states

he formation of alkali tetramers in high vibrational states from two polar molecules, XY$+$XY$\rightarrow$X${}_2$Y${}_2$, using photoassociation has been investigated for various species. Diatom-diatom interaction surfaces have been calculated using {\it ab initio} equation of motion coupled cluster and time dependent density functional van der Waals methods. Using an external electric field to improve the associated Franck Condon factors, we propose a two color time dependent wavepacket scheme to probe the high vibrational level states of various alkali tetramers.