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We present a theoretical investigation of the chemical reaction SrF + SrF$\rightarrow$ products, focusing on reactions at ultralow temperatures. We findthat bond swapping, SrF + SrF $\rightarrow$ Sr$_2$ + F$_2$, is energeticallyforbidden at these temperatures. Rather, the only energetically allowedreaction is SrF + SrF $\rightarrow$ SrF$_2$ + Sr, and even then only singletstates of the SrF$_2$ trimer can form. A calculation along a reduced reactionpath demonstrates that this abstraction reaction is barrierless, and proceedsby one SrF molecule "handing off" a fluorine atom to the other molecule.

Chemical pathways in ultracold reactions of SrF molecules