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A two molecular orbital model of poly(para-phenylene) based on the under-lying Pariser-Parr-Pople model is introduced. The model is solved using the density matrix renormalisation group method for oligomers of up to 15 repeat units.
We investigate a recent experimental study of Si(111)7 × 7 using energy-filtered reflection high energy electron diffraction (EF-RHEED). Using a simple single scattering model incorporating both surface and bulk plasmons we consider the relative intensities of the diffraction peaks of the corresponding specular and 11 rocking curves as a function of energy-loss of the reflected electrons. At its simplest...
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