  Exponential approximation based on the first order mean spherical
approximation (FMSA) is applied to the study of the structure and
thermodynamics of hard-core repulsive Yukawa fluids. The proposed theory
utilizes an exponential enhancement of the analytical solution of the FMSA due
to Tang and Lu [J. Chem. Phys., 1993, 99, 9828] for the radial distribution
function. From comparison with computer simulation data we have shown that at
low density and low temperature conditions, where original FMSA theory fails,
the FMSA-based exponential theory predicts a significant improvement.
