It is well documented that the notation for the electronic configuration (s,p,d,f) of atoms as used today originates from the words sharp, principal, diffuse, fundamental from alkali metal spectra (William B Jensen has written a nice article here). After searching for a while
I never got a chance to find the entire alkali metal spectra where we can visually show the students that this set of lines was called sharp, this set of lines is called the principal, and this is the fundamental set. Does anyone recall a photograph of a real spectrum of any alkali metal with the series labeled in any reference or text (not all the lines are in the visible)? Are there any photographic plates which label all the four series?
Who was the first person to associate the descriptors of spectral lines with angular momentum values of l = 0 implies s, l=1 implies p, l=2 is d and so on? If we look at Hund's open preview of Linienspektren "https://www.amazon.com/Linienspektren-Periodisches-Elemente-Eigenschaften-Einzeldarstellungen/dp/3642495400" pg 3, he uses the s,p,d and calls them Rydberg correction. How come they got associated with angular momentum?