It has been shown that the angular dependence of the quadrupole-quadrupole, van der Waals dipole-dipole, and repulsive interactions between nonpolar molecules can be represented, in the case of quasinormal and planar orientations of long molecular axes relative to the surface plane, by the dipole-dipole Hamiltonian with renormalized constants determined by the parameters of the interactions concerned. For a square lattice, the minimization of the generalized Hamiltonian enables one to construct a phase diagram of orientational structures of nonpolar molecules with their axes designating the ratios of anisotropic components of the dispersion and repulsive interactions to the quadrupole interactions. The orientational structures calculated, which correspond to the diagram regions with predominating quadrupole interactions, are in accordance with the structures observed in monolayers of adsorbed nonpolar molecules.

• Розенбаум Віктор Михайлович (фізико-математичні науки)

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