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

Sc (all spectra)
21 Data Rows Found 
Example of how to reference these results:
Kramida, A., Ralchenko, Yu., Reader, J., and NIST ASD Team (2024). NIST Atomic Spectra Database (ver. 5.12), [Online]. Available: https://physics.nist.gov/asd [2026, October 26]. National Institute of Standards and Technology, Gaithersburg, MD. DOI: https://doi.org/10.18434/T4W30F
BibTex Citation (new window)
 

 Ionization  Energy 
 (cm-1) 
  52 922.0          
  103 237.1          
  199 677.37         
  592 732            
  [741 620]           
  [892 700]           
  [1 113 000]           
  [1 275 000]           
  1 452 000            
  [1 816 200]           
  [2 014 760]           
  5 543 900            
  [6 111 400]           
  [6 720 000]           
  [7 472 600]           
  [8 135 100]           
  [8 819 500]           
  [9 784 000]           
  (10 388 070)           
  (45 771 184.4)         
  (48 665 527.6)         
Notes:
a Uncertainty of the listed value is unknown.

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[ASD Home][Lines Query][Levels Query][List of Spectra][Ground States and Ionization Energies][Bibliography][Help] NIST Physical Measurement Laboratory