AbstractPseudopotential approach allows to include the quantum mechanical effects and eliminates the short range classical divergence. At high temperature, when the De Broglie wavelength for a pair of particles, , is larger than the Landau length, Lij, we have to introduce quantum mechanics. For two point‐charge particles without screening, we study the pseudopotential, uij(r), numerically. We give expansions of the pair radial distribution function,gij(r) ( = exp(—βuij(r))) in increasing powers of . For a pair of electrons, exchange effects are taken into account. With these pseudopotentials, we study a dense multicomponent plasma using classical methods and we evaluate thermodynamic funct