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

Ru (all spectra)
44 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) 
  59 366.4         
  [135 200]          
  [229 600]          
  (363 000)          
  (476 000)          
  (613 000)          
  (750 000)          
  (887 000)          
  [1 439 000]          
  (1 597 000)          
  (1 774 000)          
  (1 976 000)          
  (2 186 000)          
  [2 386 600]          
  (2 807 000)          
  3 034 700           
  (5 404 000)          
  (5 831 000)          
  (6 323 000)          
  (6 815 000)          
  (7 299 000)          
  (7 912 000)          
  (8 453 000)          
  (8 993 000)          
  (9 574 000)          
  (10 106 000)          
  [11 673 000]          
  [12 152 700]          
  [12 719 500]          
  [13 384 000]          
  [14 056 700]          
  [14 473 000]          
  [15 716 800]          
  [16 236 240]          
  [38 374 000]          
  [39 834 000]          
  [41 428 000]          
  [42 953 000]          
  [45 543 000]          
  [47 276 000]          
  [49 497 000]          
  (50 907 460)          
  (211 558 314)          
  (218 040 400)          
Notes:
a Uncertainty of the listed value is unknown.

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

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