
This is only slightly different. Another mechanism that affects only the s-state is the Lamb shift. The reader should not confuse the Darwin term with the Lamb shift. The Darwin term makes the s-state and p-state the same energy, but the Lamb shift makes the s-state higher in energy than the p-state. ==Total effect== ...
Found on
http://en.wikipedia.org/wiki/Fine_structure

in spectroscopy, the splitting of the main spectral lines of an atom into two or more components, each representing a slightly different wavelength. ... [3 related articles]
Found on
http://www.britannica.com/eb/a-z/f/26

Closely spaced lines in part of the spectrum of a given element; a familiar example are the D lines of sodium. Fine structure results from the interaction between electrons in an atom and the atom's own magnetic field, which splits the various energy levels into a number of near-spaced sublevels.
Found on
http://www.daviddarling.info/encyclopedia/F/fine_structure.html

Synonym for ultrastructure ... <pathology> General term to describe the level of organisation that is below the level of resolution of the light microscope. In practice, a shorthand term for structure observed using the electron microscope, although other techniques could give information about structure in the sub micrometre range. ... (18 N...
Found on
http://www.encyclo.co.uk/local/20973

Type: Term Synonyms: ultrastructure
Found on
http://www.medilexicon.com/medicaldictionary.php?t=85680

a group of lines that are observed in the spectra of certain elements, as hydrogen, and that are caused by various couplings of the azimuthal quantum number and the angular momentum quantum number. Cf. hyperfine structure.
Found on
https://www.infoplease.com/dictionary/fine-structure
No exact match found.