Accurate prediction and measurement of vibronic branching ratios for laser cooling linear polyatomic molecules

Abstract

We report a generally applicable computational and experimental approach to determine vibronic branching ratios in linear polyatomic molecules to the $10^{-5}$ level, including for nominally symmetry forbidden transitions. These methods are demonstrated in CaOH and YbOH, showing approximately two orders of magnitude improved sensitivity compared with the previous state of the art. Knowledge of branching ratios at this level is needed for the successful deep laser cooling of a broad range of molecular species.

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• Magneto-Optical Trapping and Sub-Doppler Cooling of a Polyatomic Molecule
• Functionalizing Aromatic Compounds with Optical Cycling Centers
• Optical Trapping of a Polyatomic Molecule in an $\ell$-Type Parity Doublet State
• Characterizing the Fundamental Bending Vibration of a Linear Polyatomic Molecule for Symmetry Violation Searches
• Vibronic branching ratios for nearly-closed rapid photon cycling of SrOH
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• Blackbody thermalization and vibrational lifetimes of trapped polyatomic molecules
• Intensity-borrowing mechanisms pertinent to laser cooling of linear polyatomic molecules
• $\mathcal{T},\mathcal{P}$-odd effects in the LuOH${}^{+}$ cation
• Optical cycling in polyatomic molecules with complex hyperfine structure
• Radiative Decay Rate and Branching Fractions of MgF
• Multivalent optical cycling centers in polyatomic molecules
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• Direct measurement of high-lying vibrational repumping transitions for molecular laser cooling
• Vibronic coupling limits the use of high-lying electronic states in complex molecules for laser cooling
• Nuclear Electric Quadrupole Moment-Induced Parity Doubling in Molecules for Symmetry-Violation Searches