| Spectral Characteristic of Metallic State of Polyacetylene. (9999) | |||||||||
Abstract | |||||||||
| The absorption, reflection and ultraviolet photoemission spectra (UPS) of thin films of polyacetylene doped with perchlorate ion or potassium are studied to find the mechanism of insulator to metal transition. The transition occurs by two steps, first the charged soliton chain showing the mid gap absorption is formed in the lightly doped film, and then the metallic state is found in the heavily doped film, which is composed of polson units. The strong far infrared absorption is spectral characteristic band of polson unit. The polson chain gives a metallic far infrared reflectance along the chain direction in the heavily doped film. In the heavily doped film a genuine metallic Fermi level is found in the UPS spectra. The results are interpreted by the molecular orbital calculation of doped polyacetylene which is presented in the accompanied paper. | |||||||||
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