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courses:lecture:pplec:pplecperiodicdim 2011/08/08 11:27 courses:lecture:pplec:pplecperiodicdim 2011/08/26 10:17 current
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  * Periodic systems can take form in all three spatial dimensions:   * Periodic systems can take form in all three spatial dimensions:
-    * // 3-D periodic system example: // Unit cells of NaCl.+    * // 3-D periodic system example: // The naturally occuring photonic crystal Opal.
-Add image: pplecperiodicdim1+{{courses:lecture:pplec:pplecperiodicdimfig1.jpg|}}
-    * // 2-D periodic system example: // Hexagonal units in graphene.+Below we can also see a cartoon interpretation of the unit cells in Opal.  A 2-D periodic system can be acquired by taking only a single cross-section of unit cells in the pyramid.
-Add image: pplecperiodicdim2+{{courses:lecture:pplec:pplecperiodicdimfig2.jpg|}}
-    * // 1-D periodic system example: // String of beads connected by springs+\textbf{Image Sources: The Wikipedia article about opal crystals.}
-Add image: pplecperiodicdim3+    * // 1-D periodic system example: // a string of atoms in single-molecule conduction. 
 + 
 +{{courses:lecture:pplec:pplecperiodicdimfig3.png|}}
  * In real physical cases, the systems always physically exist 3-Dimensionally; however, the dimensionality of the periodicity is all that concerns us now.   * In real physical cases, the systems always physically exist 3-Dimensionally; however, the dimensionality of the periodicity is all that concerns us now.
 +  * Visit [[http://departments.kings.edu/chemlab/animation/nbo.html|here]] for some unit cell animations. Cesium Chloride is a good example.

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