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Lecture 6: 3D Lattices, 3D Symmetry, Space Groups

Lecture 6: 3D Lattices, 3D Symmetry, Space Groups

Lecture 6: 3D Lattices, 3D Symmetry, Space Groups

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Remember, the addition of translation led to the addition of a<br />

new symmetry element, the GLIDE PLANE (glide line in 2D),<br />

in <strong>3D</strong> there is another new symmetry element created by<br />

translations, the SCREW AXIS<br />

SCREW AXIS: combination of a rotation and a translation<br />

Screw axes are always right-handed<br />

or left-handed (come in<br />

enantiomorhpous pairs)

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