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Spectroscopic characterization of the a3Π state of aluminum monofluoride

MPS-Authors
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Walter,  Nicole
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Doppelbauer,  Maximilian
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Marx,  Silvio
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Seifert,  Johannes
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Liu,  Xiangyue
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Pérez-Ríos,  Jesús
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Truppe,  Stefan
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Meijer,  Gerard
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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5.0082601.pdf
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Citation

Walter, N., Doppelbauer, M., Marx, S., Seifert, J., Liu, X., Pérez-Ríos, J., et al. (2022). Spectroscopic characterization of the a3Π state of aluminum monofluoride. The Journal of Chemical Physics, 156(12): 124306. doi:10.1063/5.0082601.


Cite as: https://hdl.handle.net/21.11116/0000-000A-55EC-D
Abstract
Spectroscopic studies of aluminum monofluoride (AlF) have revealed its highly favorable properties for direct laser cooling. All Q lines of the strong A1Π ← X1Σ+ transition around 227 nm are rotationally closed and thereby suitable for the main cooling cycle. The same holds for the narrow, spin-forbidden a3Π ← X1Σ+ transition around 367 nm, which has a recoil limit in the µK range. We here report on the spectroscopic characterization of the lowest rotational levels in the a3Π state of AlF for v = 0–8 using a jet-cooled, pulsed molecular beam. An accidental AC Stark shift is observed on the a3Π0, v = 4 ← X1Σ+, v = 4 band. By using time-delayed ionization for state-selective detection of the molecules in the metastable a3Π state at different points along the molecular beam, the radiative lifetime of the a3Π1, v = 0, J = 1 level is experimentally determined as τ = 1.89 ± 0.15 ms. A laser/radio frequency multiple resonance ionization scheme is employed to determine the hyperfine splittings in the a3Π1, v = 5 level. The experimentally derived hyperfine parameters are compared to the outcome of quantum chemistry calculations. A spectral line with a width of 1.27 kHz is recorded between hyperfine levels in the a3Π, v = 0 state. These measurements benchmark the electronic potential of the a3Π state and yield accurate values for the photon scattering rate and for the elements of the Franck–Condon matrix of the a3Π–X1Σ+ system.