Core Electron Level Structure in C_(60)F_(18) and C_(60)F_(36) Fluorinated Fullerenes

摘要

The structure of C 1s and F 1s core electron levels in C_(60)F_(18) and C_(60)F_(36) fluorinated fullerenes has been studied by X-ray photoelectron spectroscopy using synchrotron radiation. It is established that C 1s levels of carbon atoms not bound to fluorine in these compounds are shifted down by 1.0 and 1.6 eV relative to the C1s level in the usual C_(60) fullerene, so that the binding energies of the core electron levels in C_(60)F_(18) and C_(60)F_(36) amount to E_b(C1s, C-C) = 285.7 and 286.3 eV, respectively. These values are characteristic and can be used for the identification of both homogeneous fluorinated fullerenes and combined materials comprising a mixture of various fluorinated fullerenes with each other and with different carbon-containing based materials.