forbidden transition


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forbidden transition

[fər¦bid·ən tran′zish·ən]
(quantum mechanics)
A transition between two states of a quantum-mechnical system which is considerably less probable than a competing allowed transition.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
18 represents a forbidden transition. Line Wavelength Transition no.
The values of n are equal to 1/2 and 3/2 for direct allowed and forbidden transitions, respectively.
m = 1/2 and 3/2 corresponds to direct allowed and direct forbidden transitions and m = 2, 3 corresponds to indirect allowed and indirect forbidden transitions, respectively [22].
For direct allowed transitions, m = 1/2, for the direct forbidden transitions, m = 3/2, while m = 2 and m = 3 correspond to indirect allowed and forbidden transitions.
The forbidden transitions (M1 and E2) between the 2[s.sup.2]2p-2[s.sup.2]2p and [2s2p.sup.2]-[2sp.sup.2] levels become possible through the fine-structure splitting of LS term into a series of J levels.