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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 (2023). NIST Atomic Spectra Database (ver. 5.11), [Online]. Available: https://physics.nist.gov/asd [2024, June 15]. 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    (739.32697)                  0.00015     L21139 
Oxygen  1s   2S1/2    (871.4099138)                0.0000012   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