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Contour plots of the calculated electrostatic energy of an electron in a plane near the oligopyrimidines (approx. 1.6 Å away from the hydrogen atoms to avoid oscillations near the nuclei). Isolines are drawn every 0.5 eV in an energy interval of 4 eV (black being the lowest energy). Shown are the situation in gas phase (1D), in a SAM (3D), in the bulk (3D-periodic) and the polymer (1D-periodic), anticlockwise from top left panel.
