Abstract. We present low temperature Raman spectra of NaV2O5 single crystal. The assignation of the observed modes is done on the basis of Monte Carlo calculation of excited states of Heisenberg dimerized Hamiltonian, without frustration. We found a good agreement between measured and calculated magnetic excitations for δ = 0.048 and J = 452 K. The singlet-triplet and singlet-singlet excitations as well as twomagnon mode are observed to be at 66, 127 and 132 cm −1. PACS numbers: 75.40.Gb, 78.30.Hv, 75.40.Mg 1
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