Before revision: Barkla created the x-ray notation for sharp spectral lines, noting in 1909 two separate energies, at first , naming them "A" and "B" and then supposing that there may be lines prior to "A", he started an alphabet numbering beginning with "K."Barkla, Charles G. (1911).
After revision: Barkla created the x-ray notation for sharp spectral lines noting in 1909 two separate energies, at first , naming them "A" and "B" and then supposing that there may be lines prior to "A", he started an alphabet numbering beginning with "K."Barkla, Charles G. (1911).