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

Y (all spectra)
39 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) 
  50 145.6         
  98 590           
  165 540.5         
  [488 830]          
  607 760           
  [737 110]          
  [887 400]          
  [1 033 340]          
  [1 174 700]          
  [1 498 000]          
  1 660 000           
  3 016 800           
  (3 339 000)          
  (3 734 000)          
  (4 130 000)          
  (4 509 000)          
  (5 033 000)          
  (5 460 000)          
  (5 912 000)          
  (6 372 000)          
  (6 832 000)          
  [8 150 000]          
  [8 564 600]          
  [9 035 000]          
  [9 596 000]          
  [10 107 200]          
  [10 484 000]          
  [11 514 300]          
  [11 962 150]          
  [28 737 000]          
  [30 004 000]          
  [31 391 000]          
  [32 730 000]          
  [34 677 000]          
  [36 169 000]          
  [38 102 000]          
  (39 325 420)          
  (164 663 880)          
  (170 308 700)          
Notes:
a Uncertainty of the listed value is unknown.

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