  The spectra of $A_r$ affine Toda field theories with imaginary coupling
constant, are investigated. Soliton solutions are found, which, despite the
non-unitary form of the Lagrangian, have real classical masses and are stable
to small perturbations. The quantum corrections to the soliton masses are
determined, to lowest order in $\hbar$. The solitons have the same spectrum as
the fundamental Toda particles; a feature that is preserved in the quantum
theory.

High Energy Physics - Theory