ABSTRACT
As the fluorine concentration increases (as determined by XPS measure ments), the concentration of localized carriers increases, consistent with the in crease in disorder [42]. The concentration of unpaired localized spins can thus be determined from xCO and the results are given in Table 4. The low concen tration of unpaired localized spins per carbon atom is consistent with the large
Figure 36 Temperature-dependent ESR susceptibility of the CXF fibers in the temperature range 10 K < T < 300 K. An increase is observed at low temper ature for all fibers, except for C6 6F, consistent with its metallic character. (From Ref. 69.)
localization length (^1000 A in C3.iF) measured in transport experiments [42]. Since the localization length is large, and the intrastate Coulomb repulsion is small, most localized states are doubly occupied.
