Erlangen 2022 – scientific programme
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MO: Fachverband Molekülphysik
MO 7: Cold Molecules
MO 7.5: Talk
Tuesday, March 15, 2022, 11:30–11:45, MO-H8
Hyperfine resolved optical spectroscopy of the A2Π ← X2Σ+ transition in MgF — •Maximilian Doppelbauer1, Sidney C. Wright1, Simon Hofsäss1, Boris Sartakov2, Gerard Meijer1, and Stefan Truppe1 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany — 2General Physics Institute, Russian Academy of Sciences, Vavilovstreet 38, 119991 Moscow, Russia
The group II monofluoride MgF is a promising candidate for magneto-optical trapping at high densities. However, published information on the A2Π ← X2Σ+ transition is incomplete, with many important properties not experimentally measured.
Here, we present an extensive set of hyperfine-resolved spectroscopic measurements on MgF. We recorded 25 rotational transitions with an absolute accuracy of <20 MHz. From the fitted line positions, we determined precise spectroscopic parameters for the A2Π state. We also measured the transition isotope shift between 24 rotational lines of the isotopologues 24MgF and 26MgF, and compared to the predictions within the Born-Oppenheimer approximation. We report the first experimental measurement of the radiative lifetime of the A2Π, v′=0 level and the measured electric dipole moments of the X2Σ+ and A2Π states. Electric field induced parity mixing can lead to significant optical cycling losses, unless the fields are controlled to below 1 V/cm. This new set of measurements illustrates the importance of detailed spectroscopic understanding of laser cooling candidates, and forms a stringent set of benchmarks for quantum chemical calculations.