London-Eyring-Polanyi functional form

The use of known diatomic potentials to estimate the three-atom potential function is at the heart of the so-called London-Eyring-Polanyi(-Sato) (LEP(S)) method. This is a semi-empirical scheme based on the London equation, originally intended to deal with four one-electron S-state atoms. In its most primitive form, we begin by writing the potential between two atoms as a stun of a coulomb (Q)... 

The PE function was proposed by London for H + H2 —> H2 + H, collinear system and subsequently was modified by Eyring, Polanyi and Sato. One widely used form of the LEPS function is given by... 

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