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We investigate the energetics of the atom exchange reaction in theSrF+alkali-metal atom and CaF+alkali-metal atom systems. Such reactions arepossible only for collisions of SrF and CaF with the lithium atoms, while theyare energetically forbidden for other alkali-metal atoms. Specifically, wefocus on SrF interacting with Li, Rb, and Sr atoms and use ab initio methods todemonstrate that the SrF+Li and SrF+Sr reactions are barrierless. We presentpotential energy surfaces for the interaction of the SrF molecule with the Li,Rb, and Sr atoms in their energetically lowest-lying electronic spin states.The obtained potential energy surfaces are deep and exhibit profoundinteraction anisotropies. We predict that the collisions of SrF molecules inthe rotational or Zeeman excited states most likely have a strong inelasticcharacter. We discuss the prospects for the sympathetic cooling of SrF and CaFmolecules using ultracold alkali-metal atoms.

Ab Initio Study of Chemical Reactions of Cold SrF and CaF Molecules with Alkali-Metal and Alkaline-Earth-Metal Atoms