The xhyphen;ray and ultraviolet photoemission spectra of undoped polyacetylene, AsF5hyphen;doped polyacetylene, AsF5, and AsF3are reported and compared. At a doping level near where the electrical conductivity saturates (sim;11percnt; AsF5), the As:F ratio is 1:5 and a large fraction of the arsenicndash;fluoride moieties are localized near the surface of the polyacetylene fibrils. TheC(1s) corehyphen;level spectra indicate a charge transfer of about one electron per AsF5molecule. The UPS spectra, the xhyphen;ray induced Auger spectra and CNDO calculations suggest, however, that the arsenic pentafluoride moieties are not simple AsF5hyphen;radical anions. At lower doping levels (0.1 to 1percnt;) very different results are obtained.
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