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

Br (all spectra)
35 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) 
  95 284.8         
  174 140           
  281 250           
  385 390           
  480 670           
  704 850           
  [831 000]          
  1 553 500           
  (1 807 000)          
  (2 105 000)          
  (2 428 000)          
  (2 726 000)          
  (3 170 000)          
  (3 517 000)          
  (3 880 000)          
  (4 275 000)          
  (4 654 000)          
  [5 777 600]          
  [6 137 800]          
  [6 531 300]          
  [7 018 000]          
  [7 426 500]          
  [7 766 000]          
  [8 635 300]          
  [9 026 710]          
  [22 030 000]          
  [23 144 000]          
  [24 362 000]          
  [25 561 000]          
  [27 111 000]          
  [28 416 000]          
  [30 127 000]          
  (31 205 480)          
  (131 605 591)          
  (136 607 325)          
Notes:
a Uncertainty of the listed value is unknown.

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[ASD Home][Lines Query][Levels Query][List of Spectra][Ground States and Ionization Energies][Bibliography][Help] NIST Physical Measurement Laboratory