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Pete Lohstreter wrote:
who set up the lettering scheme.I think the question is about lettering the
principle orbit locations not the orbitals. For instance, the first
orbit
is either designated as '1' or 'K' the second is '2' or 'L' etc...
Two answers, one phenomenological, one theoretical;
The lettering goes back to the earliest days of Xray
spectroscopy. Barkla labelled the various series of
lines observed in the spectrum.
http://www.nobel.se/physics/laureates/1917/barkla-lecture.pdf