  The binding energies of argon dimer are calculated by solving the homogeneous
Lippmann-Schwinger integral equation in momentum space. Our numerical analysis
using two models of argon-argon interaction developed by Patkowski {\it et al.}
confirms not only the eight argon dimer vibrational levels of the ground state
of argon dimer (i.e. for $j=0$) predicted by other groups but also provides a
very precise means for determining the binding energy of the ninth state which
its value is a matter of discussion. Our calculations have been also extended
to states with higher rotational quantum number $j$ and we have calculated the
energy of all 174 bound states for both potential models. Our numerical results
for vibrational levels of the ground state of argon dimer are in excellent
agreement with other theoretical calculations and available experimental data.
