BOUNDS ON SPIN DYNAMICS TIGHTENED BY PERMUTATION SYMMETRY - APPLICATION TO COHERENCE TRANSFER IN I2S AND I3S SPIN SYSTEMS

The effect of spin permutation symmetry on the maximum achievable effi ciency of coherence transfer between pairs of Hermitian or non-Hermiti an spin operators is investigated. It is shown that spin permutation s ymmetry may tighten significantly the quantum mechanical bounds hither to known to apply for coherence transfer processes. This feature is de monstrated for the heteronuclear coherence transfer processes S-x-->F- x, S--->F- and 2F(z)S(x)-->F-x, 2F(z)S(-) -->F- (F=Sigma(i=1)(n) I-i) in I2S and I3S (n=2, 3) spin-1/2 systems. The bounds arising from perm utation symmetry apply for non-selective multidimensional NMR experime nts.