def METHOD_NAME(self):
    """
    Ion-ion coupling parameter to determine if quantum/coupling effects
    are important. This compares Coulomb potential energy to thermal
    kinetic energy.
    """
    couple = coupling_parameter(
        self.T_e, self.n_e, (self.particle, self.particle), self.Z
    )
    if couple < 0.01:
        warnings.warn(
            f"Coupling parameter is {couple}, you might have strong coupling effects",
            CouplingWarning,
        )
    return couple