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The simple structure of the BH molecule makes it an excellent candidate fordirect laser cooling. We measure the branching ratios for the decay of the${\rm A}^{1}\Pi (v'=0)$ state to vibrational levels of the ground state, ${\rmX}^{1}\Sigma^{+}$, and find that they are exceedingly favourable for lasercooling. We verify that the branching ratio for the spin-forbidden transitionto the intermediate ${\rm a}^{3}\Pi$ state is inconsequentially small. Wemeasure the frequency of the lowest rotational transition of the X state, andthe hyperfine structure in the relevant levels of both the X and A states, anddetermine the nuclear electric quadrupole and magnetic dipole couplingconstants. Our results show that, with a relatively simple laser coolingscheme, a Zeeman slower and magneto-optical trap can be used to cool, slow andtrap BH molecules.

Vibrational branching ratios and hyperfine structure of $^{11}$BH and its suitability for laser cooling