![]() However, there are a few exceptions in experiments on diacetylenic phospholipids,144 diacetylenic phosphonate lipids,145 146 and bile.162 In these exceptional cases, some helices are observed with the opposite sense of handedness from the majority. As discussed in Sections 2-5, in most experiments on chiral materials, tubules and helical ribbons are observed with only one sense of handedness. There are two reasons to think this situation might occur. In the case of a metal surface, the Coulomb potential of the electron mirror image relative to the surface plane dictates the interaction. A more realistic approach has to take into account the dependence of the potential on the electron-surface distance. We have assumed above that the potential of an electron outside the crystal is constant Vs).
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