Meaning of Paschen-Back effect

Pa'schen-Back' effect"

Pronunciation: (pä'shun-bäk'), [key]
— Physics. Physics.
  1. a splitting of spectral lines observed when the source of a radiation is subjected to a strong magnetic field, caused when the vectors associated with the spin and orbital angular momentum exhibit individual rather than common precession. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.