Abstract
In the ac polarized Raman spectra of ${\mathrm{NaV}}_{2}{\mathrm{O}}_{5}$ we have found anomalous phonon broadening, and an energy shift of the low-frequency mode as a function of the temperature. These effects are related to the breaking of translational symmetry, caused by electrical disorder that originates from the fluctuating nature of the ${\mathrm{V}}^{4.5+}$ valence state of vanadium. The structural correlation length, obtained from comparisons between the measured and calculated Raman scattering spectra, diverges at $T<5 \mathrm{K},$ indicating the existence of the long-range charge order at very low temperatures, probably at $T=0 \mathrm{K}.$
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