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We investigate the elementary excitations of quasi one-dimensional S=1/2systems built up from zig-zag chains with general isotropic exchange constants,using exact (Lanczos) diagonalization for 24 spins and series expansionsstarting from the decoupled dimer limit. For the ideal one-dimensional zig-zagchain we discuss the systematic variation of the basic (magnon) tripletexcitation with general exchange parameters and in particular the presence ofpractically flat dispersions in certain regions of phase space. We extend thedimer expansion in order to include the effects of 3D interactions on thespectra of weakly interacting zig-zag chains. In an application to KCuCl_3 weshow that this approach allows to determine the exchange interactions betweenindividual pairs of spins from the spectra as determined in recent neutronscattering experiments.Comment: 8 pages, 9 figures; some changes, figure added; final versio

On the dynamics of coupledS= 1/2 antiferromagnetic zigzag chains