Bounds on spin dynamics tightened by permutation symmetry application to coherence transfer in I₂S and I₃S spin systems

Abstract

The effect of spin permutation symmetry on the maximum achievable efficiency of coherence transfer between pairs of Hermitian or non-Hermitian spin operators is investigated. It is shown that spin permutation symmetry may tighten significantly the quantum mechanical bounds hitherto known to apply for coherence transfer processes. This feature is demonstrated for the heteronuclear coherence transfer processes S _x → F _x , S ^- → F ^- and 2F _z S _x → F _x , 2F _z S ^- → F ^- (F = Σ ⁿ _i=1 I _i ) in I₂S and I₃S (n = 2,3) spin-1/2 systems. The bounds arising from permutation symmetry apply for non-selective multidimensional NMR experiments.