S-matrix identities in affine Toda field theories

We systematise the S-matrix/conserved charge identities in affine Toda field theories noted by Khastgir. This uses a result found by Ravanini, Tateo and Valleriani for theories based on the simply-laced Lie algebras, extended to the nonsimply-laced case. We also generalise the observation that the conserved charges form components of the eigenvectors of the Cartan matrix to the nonsimply-laced case.