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Lattice energies of crystals built of homopolar molecules were first calculated by London. His investigations were based on the theory of the van der Waals forces by Eisenschitz and London. Slater and Kirkwood came to the same conclusion with regard to the van der Waals forces by using the variation principle in their calculations. The fundamental idea that the van der Waals forces are linked up with polarization was first conceived by Debye. His treatment of the problem based on classical electrostatics has been superseded by London’s treat­ment based on wave mechanics.

The van der Waals potential and the lattice energy of a n — CH 2 chain molecule in a paraffin crystal

The van der Waals potential and the lattice energy of a n — CH ₂ chain molecule in a paraffin crystal