Source: wikibot/fine-structure

= Fine structure
{wiki=Fine_structure}

Fine structure refers to the small splittings and details observed in the spectral lines of atoms due to the interaction of the electron spin with the orbital angular momentum of the electrons in an atom. This phenomenon arises from the following effects: 1. **Spin-Orbit Coupling**: In an atom, electrons have intrinsic angular momentum (spin) and also orbital angular momentum from their motion around the nucleus.