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

Ge (all spectra)
32 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) 
  63 713.24         
  128 521.3          
  274 693            
  368 720            
  729 930            
  [934 800]           
  (1 169 000)           
  (1 423 000)           
  (1 714 000)           
  (2 033 000)           
  (2 304 000)           
  (2 629 000)           
  (2 960 000)           
  (3 283 000)           
  [4 257 800]           
  [4 575 500]           
  [4 912 400]           
  [5 346 000]           
  [5 700 000]           
  [5 998 000]           
  [6 751 900]           
  [7 101 260]           
  17 568 400            
  [18 581 000]           
  [19 669 000]           
  [20 772 000]           
  [22 076 600]           
  [23 244 000]           
  [24 790 400]           
  (25 763 710)           
  (109 347 981)           
  (113 881 010)           
Notes:
a Uncertainty of the listed value is unknown.

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