Vibronic branching ratios for nearly-closed rapid photon cycling of SrOH

Abstract

The vibrational branching ratios of SrOH for radiative decay to the ground electronic state, $X^2{\Sigma }^{+}$, from the first two electronically excited states, $A^2\Pi$ and $B^2{\Sigma }^{+}$, are determined experimentally at the $\sim 10^{-5}$ level. The observed small branching ratios enable the design of a full, practical laser-cooling scheme, including magneto-optical trapping and sub-Doppler laser cooling, with $>10^4$ photon scatters per molecule. Ab initio calculations sensitive to weak vibronic transitions are performed to facilitate the experimental measurement and analysis, and show good agreement with experiment.

6 pages, 3 figures, 3 tables

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