Peierls distortion
Distortion of a regular one-dimensional structure with a partially occupied band to give bond alternation, eventually leading to @D01744@ or @O04285@. The degree of @O04285@, \(\lambda \) depends on the electronic population of the @C01244@ indicated by the wave vector of the @F02341@ \(k_{\mathrm{F}}\) \[\lambda = 2\ \pi /k_{\mathrm{F}}\]
A Peierls distortion opens a gap at the @F02341@, producing a net stabilization of the distorted structure. The Peierls distortion for chain compounds is analogous to the @J03361@ for molecules. The prototypical example of the Peierls distortion in organic chemistry is the bond alternation present in polyvinylene.
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 381 [Terms] [Paper]