One-dimensional band structure of linear conjugated polymers

3 One-dimensional band structure of linear conjugated polymers 

The geometrical structure of rrawx-polyacetylene, which is the stable polyacetylene stereoisomer at room temperature, is illustrated in Fig. 4.1. Of particular interest is the series of alternating single and double bonds. Since the carbon atoms are sp2-hybridized (each carbon atom has three nearest neighbours), the remaining pz atomic 

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