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NIST Atomic Spectra Database
Ionization Energies Data

He (all spectra)
2 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 4]. 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
--------|----------|-------------|---------------|--------------|--------------------------------------|----------------------|-----------
      2 | Helium   | He          | 1s2           | 1S0          |         24.587389011                 |       0.000000025    |    L17714
      2 | Helium   | H           | 1s            | 2S<1/2>      |        (54.4177655282)               |       0.0000000010   |    L19200
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