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Near-Threshold Measurement of the Photoionization Cross-Section of the Lithium 2P3/2 State in a Magneto-Optical Trap

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Journal of Russian Laser Research Aims and scope

Abstract

We report a measurement of the photoionization cross-section of the lithium 2P3/2 state in a magneto-optical trap (MOT) by means of a single-frequency cw laser. Intensity of the photoionizing radiation seen by atoms is determined by means of averaging the intensity distribution of the photoionizing beam over the spatial distribution of trapped atoms. We use the photoionizing laser beam with large waist to reduce a possible misalignment between the photoionizing beam and the MOT density distribution. The excited state fraction is also accurately measured under our MOT conditions. The near-threshold photoionization cross-section of lithium-7 2P3/2 state at λPI = 349.846(1) nm is found to be equal to σ = 13.7(1.4) Mb, with better accuracy in comparison with the previous measurements. We study the variation of the photoionization cross section on the polarization of the ionizing beam. Further experiments are suggested.

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Authors and Affiliations

  1. Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya Street 13, Moscow, 125412, Russia

    Sergey A. Saakyan, Vladimir A. Sautenkov & Boris B. Zelener

  2. National Research University – Higher School of Economics, Myasnitskaya Street 20, Moscow, 101000, Russia

    Sergey A. Saakyan

  3. Lebedev Physical Institute, Russian Academy of Sciences, Leninskii Prospect 53, Moscow, 119991, Russia

    Vladimir A. Sautenkov

  4. National Research Nuclear University – Moscow Engineering Physics Institute, Kashirskoye Chaussee 31, Moscow, 115409, Russia

    Boris B. Zelener

  5. National Research University – Moscow Power Engineering Institute, Krasnokazarmennaya Street 17, Moscow, 111250, Russia

    Boris B. Zelener

Authors
  1. Sergey A. Saakyan
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  2. Vladimir A. Sautenkov
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  3. Boris B. Zelener
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Correspondence to Vladimir A. Sautenkov.

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Saakyan, S.A., Sautenkov, V.A. & Zelener, B.B. Near-Threshold Measurement of the Photoionization Cross-Section of the Lithium 2P3/2 State in a Magneto-Optical Trap. J Russ Laser Res 42, 545–553 (2021). https://doi.org/10.1007/s10946-021-09992-z

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  • DOI: https://doi.org/10.1007/s10946-021-09992-z

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