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NIST Atomic Spectra Database
Ionization Energies Data

Be (all spectra)
4 Data Rows Found 
Example of how to reference these results:
Kramida, A., Ralchenko, Yu., Reader, J., and NIST ASD Team (2023). NIST Atomic Spectra Database (ver. 5.11), [Online]. Available: https://physics.nist.gov/asd [2024, May 2]. National Institute of Standards and Technology, Gaithersburg, MD. DOI: https://doi.org/10.18434/T4W30F
BibTex Citation (new window)
  

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At. num | El. Name  | Isoel. Seq. | Ground Shells | Ground Level |        Ionization Energy (eV)        |   Uncertainty (eV)   | References
--------|-----------|-------------|---------------|--------------|--------------------------------------|----------------------|-----------
      4 | Beryllium | Be          | 1s2.2s2       | 1S0          |            9.322699                  |         0.000007     |     L5964
      4 | Beryllium | Li          | 1s2.2s        | 2S<1/2>      |           18.21115                   |         0.00004      |    L12158
      4 | Beryllium | He          | 1s2           | 1S0          |         (153.896205)                 |         0.000004     |    L10054
      4 | Beryllium | H           | 1s            | 2S<1/2>      |         (217.71858459)               |         0.00000010   |    L19200
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