symmetry

symmetry - Symmetry Operations E: Identity operation: The E...

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Symmetry Operations E: Identity operation: The E operation does nothing. All molecules have this element C n : Proper rotation: Rotation of molecule by an angle 360/n about an axis through the center of mass (COM) gives no change. C 2 rotates 180°, C 6 rotates 60°. The rotation axis with the largest n is the principal axis. CH 3 H H H 3 C H 3 C H H CH 3 C 2 i : Inversion: All atoms are inverted through the center of mass to the opposite side of the molecule. Cl i W Cl Cl Cl Cl Cl Cl σ h : Horizontal mirror plane: Mirror plane that is perpendicular to the principal rotation axis (largest C n ). C 4 σ h H H H H H H H H H H H H H H H H σ v : Vertical mirror plane: Mirror plane that is parallel to, and encompasses, the principal rotation axis. σ d : Dihedral mirror plane: A σ v that bisects angle between C 2 axes to principal axis. Br Br H H C 2 σ v Br Br H H S n : Improper rotation: This operation is the product of a C n rotation followed by a σ h . Note that S 2 , which is the product of C 2 and σ h
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symmetry - Symmetry Operations E: Identity operation: The E...

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