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  Preparation of individual magnetic sub-levels of 4He(23S1) in a supersonic beam using laser optical pumping and magnetic hexapole focusing

Sixt, T., Guan, J., Tsoukala, A., Hofsäss, S., Muthu-Arachchige, T., Stienkemeier, F., et al. (2021). Preparation of individual magnetic sub-levels of 4He(23S1) in a supersonic beam using laser optical pumping and magnetic hexapole focusing. Review of Scientific Instruments, 92(7): 073203. doi:10.1063/5.0048323.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0009-44B3-0 Version Permalink: https://hdl.handle.net/21.11116/0000-000F-1C63-3
Genre: Journal Article

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 Creators:
Sixt, Tobias1, Author
Guan, Jiwen1, 2, Author
Tsoukala, Alexandra1, Author
Hofsäss, Simon1, 3, Author           
Muthu-Arachchige, Thilina1, 4, Author
Stienkemeier, Frank1, Author
Dulitz, Katrin1, Author
Affiliations:
1Institute of Physics, University of Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany, ou_persistent22              
2National Synchrotron Radiation Laboratory, University of Science and Technology of China, 230029 Hefei, People’s Republic of China., ou_persistent22              
3Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              
4Institute of Applied Physics, University of Bonn, Wegelerstr. 8, 53115 Bonn, Germany., ou_persistent22              

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 Abstract: We compare two different experimental techniques for the magnetic-sub-level preparation of metastable 4He in the 23S1 level in a supersonic beam, namely, magnetic hexapole focusing and optical pumping by laser radiation. At a beam velocity of v = 830 m/s, we deduce from a comparison with a particle trajectory simulation that up to 99% of the metastable atoms are in the MJ″ = +1 sub-level after magnetic hexapole focusing. Using laser optical pumping via the 23P2–23S1 transition, we achieve a maximum efficiency of 94% ± 3% for the population of the MJ″ = +1 sub-level. For the first time, we show that laser optical pumping via the 23P1–23S1 transition can be used to selectively populate each of the three MJ″ sub-levels (MJ″ = −1, 0, +1). We also find that laser optical pumping leads to higher absolute atom numbers in specific MJ″ sub-levels than magnetic hexapole focusing.

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Language(s): eng - English
 Dates: 2021-02-222021-06-142021-07-022021-07
 Publication Status: Issued
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1063/5.0048323
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Title: Review of Scientific Instruments
  Abbreviation : Rev. Sci. Instrum.
Source Genre: Journal
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Publ. Info: Melville, NY : AIP Publishing
Pages: 10 Volume / Issue: 92 (7) Sequence Number: 073203 Start / End Page: - Identifier: ISSN: 0034-6748
CoNE: https://pure.mpg.de/cone/journals/resource/991042742033452