intercombination line

intercombination line

[¦in·tər‚käm·bə′nā·shən ‚līn]
(astronomy)
A spectral line emitted in a transition between energy levels that have different multiplicities, that is, different values of the total spin quantum number.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.