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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 (2013). NIST Atomic Spectra Database (ver. 5.1), [Online]. Available: http://physics.nist.gov/asd [2014, September 2]. National Institute of Standards and Technology, Gaithersburg, MD.
BibTex Citation (new window)
 

 At. Num.   El.  name   Isoel.  Seq.   Ground  Shells   Ground  Level   Ionization  Energy a 
 (eV) 
 References 
Beryllium  Be  1s22s2   1S0    9.322699(7)              L5964 
Beryllium  Li  1s22s   2S1/2    18.211153(40)             L12158 
Beryllium  He  1s2   1S0    [153.896198(4)]             L10054 
Beryllium  1s   2S1/2    (217.7185766(10))           L3620c97 
Notes:
Uncertainty is given in parentheses after the value. It is expressed in the units of the last decimal place of the value.

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