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

Fe (all spectra)
26 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) 
  63 737.704         
  130 655.4           
  247 220             
  442 900             
  [604 900]            
  798 370             
  1 007 928             
  1 218 380             
  [1 884 000]            
  [2 114 000]            
  [2 346 000]            
  [2 668 200]            
  [2 912 000]            
  [3 163 000]            
  3 679 500             
  [3 946 570]            
  [10 184 000]            
  [10 951 200]            
  [11 772 000]            
  12 708 000             
  [13 606 800]            
  [14 505 300]            
  [15 731 400]            
  (16 500 160)            
  (71 204 125.4)          
  (74 829 605.3)          
Notes:
a Uncertainty of the listed value is unknown.

If you did not find the data you need, please inform the ASD Team.

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