Abstract

High-resolution electron energy loss spectroscopy (HREELS) has been used to study the surface vibrational characteristics of ∼100-A-thick films of bisphenol-A-polycarbonate, polyethylene, and poly(2-vinylpyridine). Several vibrational modes of each polymer show significant intensity variations with primary beam energy, indicating electron interaction with the polymer surface via temporary negative-ion resonances. In high-density polyethylene, a simple dipole-allowed infrared-likc spectrum exists for beam energies <3 eV, whereas resonant enhancement of nondipole modes characterize the spectrum at higher beam energies

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