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Contour plots of the ground-state density matrices and electronic modes of naphthalene (the first and the second rows) and the DN-n family (the third and the fourth rows). The x(y) axes label hole (electron) coordinates. Labels indicate the molecule (Fig. 1) and the electronic mode (Figs. 2–4) [e.g., N(ρ) is ground state of naphtalene, DN6(a1) is mode 1a of DN-6]. Mode frequencies are given in Tables 1 and 2. The color code is shown in the second row.
