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Transition rule - Wikipedia, the free encyclopedia Wikipedia (2007) - wikipedia2007.classicistranieri.com

Transition rule

From Wikipedia, the free encyclopedia

The transition rules describe possible state transitions of a quantum mechanical system, expressed by changes of the quantum numbers.

See also: selection rule

Transition rules exist for various types of quantum numbers:

Transitions of an electron orbiting an atom.

For the difference between the initial state described by the quantum numbers

(n, l, m)

and the final state

(n', l', m')

, the following conditions have to hold:

$\Delta l = (l - l') = \pm 1$ and $\Delta m = (m - m') = 0 , \pm 1$

Vibrational transitions of diatomic molecules. Change of vibrational quantum number $n$ :

$\Delta n = \pm 1$

Rotational transitions of molecules. Change of the rotational quantum number $J$ :

$\Delta J = \pm 1$

The transition rules determine the structure of atomic spectra.

This physics-related article is a stub. You can help Wikipedia by expanding it.

Retrieved from "http://en.wikipedia.org../../../t/r/a/Transition_rule.html"

Categories: Physics stubs | Spectroscopy

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