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| Point Group Symmetry |
Point group symmetry is a significant property of molecules extensively used in several branches of chemistry: spectroscopy, quantum chemistry and crystallography.
An entity point group is characterizing through a set of symmetry operations:
- E - the individuality operation
- Cn - rotation by 2π/n angle *
- Sn - improper rotation (rotation by 2π/n angle and indication in the plane perpendicular to the axis)
- σh - horizontal reflection plane (perpendicular to the principal axis) **
- σv - vertical reflection plane (encloses the principal axis)
- σd - diagonal reflection plane (encloses the principal axis and bisect the angle among two C2 axes perpendicular to the principal axis)
* - n is an integer
** - principal axis is a Cn axis with the largest n.
Molecule belongs to a symmetry point group if it is untouched under all the symmetry operations of this group.** - principal axis is a Cn axis with the largest n.
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