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We extend the picture of a transfer of nuclear spin-1/2 polarization along ahomogeneous one-dimensional chain with the XY-Hamiltonian to the inhomogeneouschain with alternating nearest neighbour couplings and alternating Larmorfrequencies. To this end, we calculate exactly the spectrum of the spin-1/2XY-Hamiltonian of the alternating chain with an odd number of sites. The exactspectrum of the XY-Hamiltonian is also applied to study the multiple quantum(MQ) NMR dynamics of the alternating spin-1/2 chain. MQ NMR spectra are shownto have the MQ coherences of zero and $\pm$ second orders just as in the caseof a homogeneous chain. The intensities of the MQ coherences are calculated.Comment: 10 pages, 4 figure

Exact results on spin dynamics and multiple quantum NMR dynamics in alternating spin-1/2 chains with XY Hamiltonian at high temperatures