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We consider strips of Ising spins at criticality. For strips of width $N$sites, subdominant (additive) finite-size corrections to scaling are assumed tobe of the form $a_k/N^k$ for the free energy, and $b_k/N^k$ for inversecorrelation length, with integer values of $k$. We investigate the set$\{a_k,b_k\}$ ($k \geq 2$) by exact evaluation and numerical transfer-matrixdiagonalization techniques, and their changes upon varying anisotropy ofcouplings, spin quantum number $S$, and (finite) interaction range, in allcases for both periodic (PBC) and free (FBC) boundary conditions across thestrip. We find that the coefficient ratios $b_k/a_k$ remain constant uponvarying coupling anisotropy for $S=1/2$ and first-neighbor couplings, for bothPBC and FBC (albeit at distinct values in either case). Such universal behavioris not maintained upon changes in $S$ or interaction range.

Universal and non-universal amplitude ratios for scaling corrections on Ising strips