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NIST Atomic Spectra Database
Ionization Energies Data

Si (all spectra)
14 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) 
  65 747.76         
  131 838.14         
  270 139.3          
  364 093.1          
  1 345 070            
  [1 655 690]           
  [1 988 730]           
  [2 448 640]           
  [2 833 300]           
  [3 237 350]           
  [3 841 400]           
  (4 221 630)           
  (19 661 038.1)         
  (21 560 634.27)        
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