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- Laporte_rule abstract "The Laporte rule is a spectroscopic selection rule that only applies to centrosymmetric molecules (those with an inversion centre) and atoms. It states that electronic transitions that conserve parity, either symmetry or antisymmetry with respect to an inversion centre — i.e., g (gerade = even (German)) → g, or u (ungerade = odd) → u respectively—are forbidden. Allowed transitions in such molecules must involve a change in parity, either g → u or u → g. As a consequence, if a molecule is centrosymmetric, transitions within a given set of p or d orbitals (i.e., those that only involve a redistribution of electrons within a given subshell) are forbidden.A designation of g for an orbital means there is symmetry with respect to an inversion center. That is, if all the atoms are inverted across the inversion center, the resulting orbital would look exactly the way it did before having inversion applied to it. (This includes same orientation in space). A designation of u means the orbital is antisymmetric with respect to the inversion center, and changes sign everywhere upon inversion. The rule originates from a quantum mechanical selection rule that, during an electron transition, parity should be inverted.However, forbidden transitions are allowed if the centre of symmetry is disrupted, and indeed, such apparently forbidden transitions are then observed in experiments. Disruption of the centre of symmetry occurs for various reasons, such as the Jahn-Teller effect and asymmetric vibrations. Complexes are not perfectly symmetric all the time. Transitions that occur as a result of an asymmetrical vibration of a molecule are called vibronic transitions, such as those caused by vibronic coupling. Through such asymmetric vibrations, transitions that would theoretically be forbidden, such as a d → d transition, are weakly allowed.The rule is named after Otto Laporte. It is relevant, in particular, to the electronic spectroscopy of transition metals. Octahedral complexes have a center of symmetry (exact or approximate) so that d → d transitions are forbidden by the Laporte rule and are observed to be quite weak. However tetrahedral complexes have no center of symmetry so that the Laporte rule does not apply, and have more intense spectra.".
- Laporte_rule wikiPageID "1757763".
- Laporte_rule wikiPageLength "3744".
- Laporte_rule wikiPageOutDegree "19".
- Laporte_rule wikiPageRevisionID "649081732".
- Laporte_rule wikiPageWikiLink Category:Spectroscopy.
- Laporte_rule wikiPageWikiLink Center_of_symmetry.
- Laporte_rule wikiPageWikiLink Centrosymmetric.
- Laporte_rule wikiPageWikiLink Centrosymmetry.
- Laporte_rule wikiPageWikiLink Even_and_odd_functions.
- Laporte_rule wikiPageWikiLink Fixed_points_of_isometry_groups_in_Euclidean_space.
- Laporte_rule wikiPageWikiLink Forbidden_mechanism.
- Laporte_rule wikiPageWikiLink Jahn-Teller_effect.
- Laporte_rule wikiPageWikiLink Jahn–Teller_effect.
- Laporte_rule wikiPageWikiLink Ligand_field_theory.
- Laporte_rule wikiPageWikiLink Octahedral_molecular_geometry.
- Laporte_rule wikiPageWikiLink Otto_Laporte.
- Laporte_rule wikiPageWikiLink Parity_(physics).
- Laporte_rule wikiPageWikiLink Quantum_Mechanics.
- Laporte_rule wikiPageWikiLink Quantum_mechanics.
- Laporte_rule wikiPageWikiLink Selection_rule.
- Laporte_rule wikiPageWikiLink Symmetry.
- Laporte_rule wikiPageWikiLink Tanabe-Sugano_diagram.
- Laporte_rule wikiPageWikiLink Tanabe–Sugano_diagram.
- Laporte_rule wikiPageWikiLink Tetrahedral_molecular_geometry.
- Laporte_rule wikiPageWikiLink Transition_metal.
- Laporte_rule wikiPageWikiLink Ultraviolet-visible_spectroscopy.
- Laporte_rule wikiPageWikiLink Ultraviolet–visible_spectroscopy.
- Laporte_rule wikiPageWikiLink Vibronic_coupling.
- Laporte_rule wikiPageWikiLink Vibronic_spectroscopy.
- Laporte_rule wikiPageWikiLink Vibronic_transition.
- Laporte_rule wikiPageWikiLinkText "Laporte rule".
- Laporte_rule wikiPageWikiLinkText "Laporte".
- Laporte_rule wikiPageWikiLinkText "Laporte's rule".
- Laporte_rule wikiPageWikiLinkText "laporte rule".
- Laporte_rule hasPhotoCollection Laporte_rule.
- Laporte_rule wikiPageUsesTemplate Template:Physical-chemistry-stub.
- Laporte_rule subject Category:Spectroscopy.
- Laporte_rule hypernym Rule.
- Laporte_rule type AdministrativeRegion.
- Laporte_rule type Physic.
- Laporte_rule type Technique.
- Laporte_rule comment "The Laporte rule is a spectroscopic selection rule that only applies to centrosymmetric molecules (those with an inversion centre) and atoms. It states that electronic transitions that conserve parity, either symmetry or antisymmetry with respect to an inversion centre — i.e., g (gerade = even (German)) → g, or u (ungerade = odd) → u respectively—are forbidden. Allowed transitions in such molecules must involve a change in parity, either g → u or u → g.".
- Laporte_rule label "Laporte rule".
- Laporte_rule sameAs Reguxc5x82a_Laportea.
- Laporte_rule sameAs m.05tm3d.
- Laporte_rule sameAs Q9305600.
- Laporte_rule sameAs Q9305600.
- Laporte_rule wasDerivedFrom Laporte_rule?oldid=649081732.
- Laporte_rule isPrimaryTopicOf Laporte_rule.