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Module 2 : Molecular Structure

Lecture 10 : Non-covalent interactions 1: Intermolecular Forces

The other common models for intermolecular potentials are the hard sphere potential, U_HS(r) and the square well potential, U _sw(r) defined by


U_HS(r) = 0 if r > = if r	(10.5)


U_SW (r) = if r = - if < r + = 0 if r > +	(10.6)

The three potentials are shown in Fig 10.1


Fig 10.1 (a) The Lennard Jones potential, (b) The hard sphere potential and (c) The square well potential.

The other common models for intermolecular potentials are the hard sphere potential, UHS(r) and the square well potential, U sw(r) defined by