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

Se (all spectra)
34 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) 
  78 658.15         
  170 960            
  255 650            
  346 390            
  [550 900]           
  659 980            
  1 252 800            
  (1 484 000)           
  (1 766 000)           
  (2 057 000)           
  (2 347 000)           
  (2 766 000)           
  (3 089 000)           
  (3 436 000)           
  (3 815 000)           
  (4 170 000)           
  [5 246 300]           
  [5 592 500]           
  [5 966 900]           
  [6 436 000]           
  [6 821 600]           
  [7 151 000]           
  [7 981 500]           
  [8 358 820]           
  [20 492 000]           
  [21 568 000]           
  [22 743 000]           
  [23 909 000]           
  [25 373 000]           
  [26 631 000]           
  [28 287 000]           
  (29 330 560)           
  (123 947 194)           
  (128 791 473)           
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