Unformatted text preview: Table 12.1 Symmetry Element Operations Symbol
for Element
and Operation Element Operation
i Center of symmetry Projection through the
(or inversion ' center of symmetry to
center) an equal distance on the
other side from the center
C” Proper rotation axis Counterclockwise rotation,
about the Cn axis by 211/11
(or 360°/n), Where n is an
' integer
0‘ Symmetry plane Reﬂection across the plane
of symmetry
Sn Improper rotation Counterclockwise rotation
axis (also referred about the Sn axis by 217/21
to as a rotation— followed by reﬂection in a
reﬂection axis or plane perpendicular to the
alternating axis) axis (i.e., the combined
operation of a Cn rotation
followed by reﬂection
across a oh mirror plane)
E Identity element The operation that leaves the system unchanged ...
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 Fall '08
 KLIER

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