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We use narrow-band laser excitation of Yb to substantially enhance thebrightness of a cold beam of YbOH, a polyatomic molecule with high sensitivityto physics beyond the Standard Model (BSM). By exciting atomic Yb to themetastable $^3$P$_1$ state in a cryogenic environment, we significantlyincrease the chemical reaction cross-section for collisions of Yb withreactants. We characterize the dependence of the enhancement on the propertiesof the laser light, and study the final state distribution of the YbOHproducts. The resulting bright, cold YbOH beam can be used to increase thestatistical sensitivity in searches for new physics utilizing YbOH, such aselectron electric dipole moment (eEDM) and nuclear magnetic quadrupole moment(NMQM) experiments. We also perform new quantum chemical calculations thatconfirm the enhanced reactivity observed in our experiment. Additionally, ourcalculations compare reaction pathways of Yb($^3$P) with the reactants H$_2$Oand H$_2$O$_2$. More generally, our work presents a broad approach forimproving experiments that use cryogenic molecular beams for laser cooling andprecision measurement searches of BSM physics.

Enhanced Yield from a Cryogenic Buffer Gas Beam Source via Excited State Chemistry