  We investigate the spectrum and decay rates of low lying charmonium states
within the framework of the non relativistic quark model by employing a Coulomb
like potential from the perturbative one gluon exchange and the linear
confining potential along with the potential derived from instanton vacuum to
account for the hyperfine mass splitting of charmonium states in variational
approach. We predict radiative E1, M1, two-photon, leptonic and two-gluon decay
rates of low lying charmonium states. An overall agreement is obtained with the
experimental masses and decay widths.
