K-beta
Encyclopedia
K-beta emissions, similar to K-alpha
K-alpha
In X-ray spectroscopy, K-alpha emission lines result when an electron transitions to the innermost "K" shell from a 2p orbital of the second or "L" shell...

emissions, result when an electron transitions to the innermost "K" shell (principal quantum number 1) from a 3p orbital of the second or "M" shell (with principal quantum number 3).

Values can be found in the X-Ray Transition Energies Database.
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