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National Institute of Standards and Technology NIST Physical Measurement Laboratory
NIST Atomic Spectra Database
Ionization Energies Data

C (all spectra)
6 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, July 23]. 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 
Carbon  1s22s22p2   3P0    11.260296                L7288 
Carbon  1s22s22p   21/2    [24.3845(9)]              L11770 
Carbon  Be  1s22s2   1S0    47.88778(12)             L876 
Carbon  Li  1s22s   2S1/2    64.49358(19)             L11667 
Carbon  He  1s2   1S0    [392.09050(3)]             L10054 
Carbon  1s   2S1/2    (489.993177(6))            L7188 
Notes:
Uncertainty, if known, 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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