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  Spectroscopic characterization of the a3Π state of aluminum monofluoride

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.

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 Creators:
Walter, Nicole1, Author           
Doppelbauer, Maximilian1, Author           
Marx, Silvio1, Author           
Seifert, Johannes1, Author           
Liu, Xiangyue1, Author           
Pérez-Ríos, Jesús1, Author           
Sartakov, Boris G.2, Author
Truppe, Stefan1, Author           
Meijer, Gerard1, Author           
Affiliations:
1Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              
2Prokhorov General Physics Institute, Russian Academy of Sciences, Vavilovstreet 38, 119991 Moscow, Russia, ou_persistent22              

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 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.

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Language(s): eng - English
 Dates: 2021-12-162022-02-212022-02-242022-03-28
 Publication Status: Published in print
 Pages: 16
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1063/5.0082601
 Degree: -

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Project name : CoMoFun - Cold Molecules for Fundamental Physics
Grant ID : 949119
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: The Journal of Chemical Physics
  Abbreviation : J. Chem. Phys.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Institute of Physics
Pages: 16 Volume / Issue: 156 (12) Sequence Number: 124306 Start / End Page: - Identifier: ISSN: 0021-9606
CoNE: https://pure.mpg.de/cone/journals/resource/954922836226