Electronic states in polypyrrole

Electron energy loss spectra of valence excitations in polypyrrole doped with boron tetrafluoride, undoped, and subsequently redoped with arsenic pentafluoride were measured

J.J. Ritsko

2003

Scholarcy highlights

  • Electron energy loss spectra of valence excitations in polypyrrole doped with boron tetrafluoride, undoped, and subsequently redoped with arsenic pentafluoride were measured
  • Energy loss peaks associated with intraband and interband excitations which show characteristically different momentum dependence were observed
  • Intraband peaks exhibit weak negative dispersion while interband excitations show strong positive dispersion. This suggests that interband excitations occur between wide energy bands in long polymetric molecules while intraband excitations may be due to intrinsic or extrinsic intermolecular charge transfer transitions in a narrow band
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