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

Rb (all spectra)
37 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) 
  33 690.81         
  220 105.0          
  [316 550]           
  [421 000]           
  (552 000)           
  (669 000)           
  [795 800]           
  [1 071 000]           
  1 214 900            
  2 235 100            
  (2 525 000)           
  (2 871 000)           
  (3 226 000)           
  (3 573 000)           
  (4 049 000)           
  (4 436 000)           
  (4 847 000)           
  (5 275 000)           
  (5 694 000)           
  [6 914 000]           
  [7 302 000]           
  [7 733 900]           
  [8 257 000]           
  [8 714 300]           
  [9 073 000]           
  [10 021 800]           
  [10 441 390]           
  [25 272 000]           
  [26 463 000]           
  [27 766 000]           
  [29 034 000]           
  [30 771 000]           
  [32 169 000]           
  [33 990 000]           
  (35 140 490)           
  (147 646 931)           
  (152 967 464)           
Notes:
a Uncertainty of the listed value is unknown.

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