semiforbidden transition

semiforbidden transition

[¦sem·i·fər′bid·ən tran′zish·ən]
(atomic physics)
An atomic transition whose probability is reduced by selection rules by a factor roughly of the order of 106, as compared with 109 for a forbidden transition.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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