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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, April 19]. National Institute of Standards and Technology, Gaithersburg, MD. DOI: https://doi.org/10.18434/T4W30F
BibTex Citation (new window)
 

 At. Num.   Ion  Charge   El.  name   Ionization  Energy 
 (eV) 		 Uncertainty
 (eV) 		  References 
4  0  Beryllium    9.322699                   0.000007     L5964 
4  +1  Beryllium    18.21115                    0.00004      L12158 
4  +2  Beryllium    (153.896205)                  0.000004     L10054 
4  +3  Beryllium    (217.71858459)                0.00000010   L19200 

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[ASD Home][Lines Query][Levels Query][List of Spectra][Ground States and Ionization Energies][Bibliography][Help] NIST Physical Measurement Laboratory