Why are the orbitals shells called s, p, d, f, etc.? Is there a reason?

Why are the orbitals shells called s, p, d, f, etc.? Is there a reason?

Notes credit : Elson Liu, Ph.D in electrical engineering

Picture credit : internet
The s, p, d, and f stand for "sharp," "principal," "diffuse," and "fundamental," respectively, and are so named because they categorize the spectral lines generated by those types of orbitals: Electron configuration

A brief introduction to the history behind these labels can be found in W. B. Jensen, "The origin of the s, p, d, f orbital labels," J. Chem. Educ., vol. 84, no. 5, pp. 757-758, May 2007. [Online]. Available:http://dx.doi.org/10.1021/ed084p757.  Apparently the "sharp," "principal," and "diffuse" characterizations were devised first by the British chemists George Liveing and Sir James Dewar in the 1870s (their papers were compiled and published asCollected papers on spectroscopy, which is available online at http://catalog.hathitrust.org/Rehttp://catalog.hathitrust.org/Re...), and the "fundamental" characterization came later, due to the work of Arno Bergmann around 1907.
Source : Internet(qoura.com)
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