
(from the article `spectroscopy`) For atoms in the first three rows and those in the first two columns of the periodic table, the atom can be described in terms of quantum numbers ... ...concentrated at that point. The quantity Lc in equation (83) is sometimes called the body`s spin, and r p is called the orbital angular momentum. ... ...
Found on
http://www.britannica.com/eb/a-z/o/27

the component of angular momentum of an electron in an atom or a nucleon in a nucleus, arising from its orbital motion rather than from its spin.
Found on
https://www.infoplease.com/dictionary/orbital-angular-momentum
No exact match found.