fine structure 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 level into a number of near-spaced sublevels. Related category • SPECTRA AND SPECTROSCOPY Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |