NIST Physical Measurement Laboratory Handbook of Basic Atomic Spectroscopic Data

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Atomic Data for Carbon (C)

Atomic Number = 6

Atomic Weight = 12.011

Reference E95

Isotope   Mass       Abundance Spin Mag Moment
12C 12.000000 98.90% 0 13C 13.003355 1.10% 1/2 +0.70241
C I  Ground State 1s22s22p2  3P0
     Ionization energy  90820.45 cm-1 (11.26030 eV)   Ref. J66
C II Ground State 1s22s22p  21/2
     Ionization energy  196664.7 cm-1 (24.3833 eV)   Ref. MG93