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Characterisation of the b3Σ+ state and its interaction with the A1Π state in aluminium monofluoride

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

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

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Hofsäss,  Simon
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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Schewe,  Hanns Christian
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Kray,  Sebastian
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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Citation

Doppelbauer, M., Walter, N., Hofsäss, S., Marx, S., Schewe, H. C., Kray, S., et al. (2021). Characterisation of the b3Σ+ state and its interaction with the A1Π state in aluminium monofluoride. Molecular Physics, 119(1-2): e1810351. doi:10.1080/00268976.2020.1810351.


Cite as: http://hdl.handle.net/21.11116/0000-0007-09BB-D
Abstract
Recently, we determined the detailed energy level structure of the X1Σ+, A1Π and a3Π states of AlF that are relevant to laser cooling and trapping experiments [Truppe et al., Phys. Rev. A. 100 (5), 052513 (2019)]. Here, we investigate the b3Σ+,v=0 state of the AlF molecule. A rotationally resolved (1 + 2)-REMPI spectrum of the b3Σ+,v′=0 ← a3Π, v′′=0 band is presented and the lifetime of the b3Σ+,v=0 state is measured to be 190(2) ns. Hyperfine-resolved, laser-induced fluorescence spectra of the b3Σ+,v′=0 ← X1Σ+, v′′ = 1 and the b3Σ+,v ′ = 0 ← a3Π, v′′ = 0 bands are recorded to determine fine- and hyperfine structure parameters. The interaction between the b3Σ+,v = 0 and the nearby A1Π state is studied and the magnitude of the spin–orbit coupling between the two electronic states is derived using three independent methods to give a consistent value of 10(1) cm-1. The triplet character of the A state causes an A → a loss from the main A−X laser cooling cycle below the 10-6 level.