Lifetime Measurements of the $A^2{\Pi }_{1/2}$ and $A^2{\Pi }_{3/2}$ States in BaF

Abstract

Time resolved detection of laser induced fluorescence from pulsed excitation of electronic states in barium monofluoride (BaF) molecules has been performed in order to determine the lifetimes of the $A^2{\Pi }_{1/2}$ and $A^2{\Pi }_{3/2}$ states. The method permits control over experimental parameters such that systematic biases in the interpretation of the data can be controlled to below $10^{-3}$ relative accuracy. The statistically limited values for the lifetimes of the $A^2{\Pi }_{1/2}(\nu =0)$ and $A^2{\Pi }_{3/2}(\nu =0)$ states are 57.1(3) ns and 47.9(7)~ns, respectively. The ratio of these values is in good agreement with scaling for the different excitation energies. The investigated molecular states are of relevance for an experimental search for a permanent electric dipole moment (EDM) of the electron in BaF.

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• Laser cooling of barium monofluoride molecules using synthesized optical spectra
• Laser Spectroscopy of the y${}^7$P${}_J^{\circ }$ states of Cr I
• Deflection of barium monofluoride molecules using the bichromatic force: A density-matrix simulation
• Molecular laser cooling using serrodynes: Implementation, characterization and prospects
• Magnetic hyperfine structure constants of ${}^{137}$BaF in the ${}^2{\Pi }_{1/2}$ and ${}^2{\Pi }_{3/2}$ excited states
• High-resolution spectroscopy of barium monofluoride: Odd isotopologues, hyperfine structure and isotope shifts
• A novel method to determine the phase-space distribution of a pulsed molecular beam
• Single-photon loading of polar molecules into an optical trap