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NIST Atomic Spectra Database
Ionization Energies Data

La (all spectra)
57 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) 
  44 981           
  90 212.8         
  154 675           
  [402 900]          
  [497 000]          
  (597 000)          
  (710 000)          
  (847 000)          
  (960 000)          
  [1 221 300]          
  [1 361 200]          
  (2 218 000)          
  (2 444 000)          
  (2 678 000)          
  (2 936 000)          
  (3 170 000)          
  (3 476 000)          
  (3 742 000)          
  (4 017 000)          
  (4 299 000)          
  (4 565 000)          
  (5 614 000)          
  (5 896 000)          
  (6 210 000)          
  (6 501 000)          
  (6 977 000)          
  (7 307 000)          
  (8 025 000)          
  [8 380 800]          
  (14 518 000)          
  (15 195 000)          
  (15 921 000)          
  (16 688 000)          
  (17 438 000)          
  (18 220 000)          
  (19 172 000)          
  (19 946 000)          
  (20 785 000)          
  (21 567 000)          
  (23 793 000)          
  (24 487 000)          
  (25 269 000)          
  (25 987 000)          
  (27 552 000)          
  (28 350 000)          
  (29 875 000)          
  (30 649 000)          
  (69 920 000)          
  (71 896 000)          
  (74 074 000)          
  (76 115 000)          
  (81 752 000)          
  (84 091 000)          
  (87 019 000)          
  (88 990 400)          
  (364 118 950)          
  (372 997 250)          
Notes:
a Uncertainty of the listed value is unknown.

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