Lifetime measurements of the A 2Π1/2 and A 2Π3/2 states in BaF

NL-eEDM Collaboration

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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 A2Π1/2 and A2Π3/2 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 A2Π1/2(ν=0) and A2Π3/2(ν=0) states are 57.1(3) and 47.9(7) ns, respectively. Although discrepancies between presently and previously measured lifetimes and theoretical values persist, the ratio of these values is in good agreement with scaling for the different excitation energies. The results serve as a benchmark for current molecular structure calculations. The investigated molecular states are of relevance for an experimental search for a permanent electric dipole moment of the electron in BaF.

Original languageEnglish
Article number052503
Pages (from-to)1-5
Number of pages5
JournalPhysical Review A
Issue number5
Early online date12 Nov 2019
Publication statusPublished - Nov 2019


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