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NIST Atomic Spectra Database
Ionization Energies Data

O (all spectra)
8 Data Rows Found 

Example of how to reference these results:
Kramida, A., Ralchenko, Yu., Reader, J., and NIST ASD Team (2019). NIST Atomic Spectra Database (ver. 5.7.1), [Online]. Available: https://physics.nist.gov/asd [2019, November 22]. National Institute of Standards and Technology, Gaithersburg, MD. DOI: https://doi.org/10.18434/T4W30F
BibTex Citation (new window)
 

 At. Num.   El.  name   Isoel.  Seq.   Ground  Shells   Ground  Level   Ionization  Energy 
 (eV) 
Uncertainty
 (eV) 
 References 
Oxygen  1s22s22p4   3P2    13.618055                 0.000007   L74,L3760 
Oxygen  1s22s22p3   43/2    35.12112                  0.00006    L11267,L10621 
Oxygen  1s22s22p2   3P0    [54.93554]                 0.00012    L11770 
Oxygen  1s22s22p   21/2    77.41350                  0.00025    L648 
Oxygen  Be  1s22s2   1S0    113.8990                   0.0005     L7288 
Oxygen  Li  1s22s   2S1/2    [138.1189]                  0.0021     L4713 
Oxygen  He  1s2   1S0    [739.32682]                 0.00006    L10054 
Oxygen  1s   2S1/2    (871.40988)                 0.00003    L7188 

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