Absrtact.The Raman spectra in the region of the O-H stretching vibration band are used to investigate the effect of lanthanide (III) ions on liquid water structure in concentrated aqueous solutions of CeCl 3 and GdCl 3 (C~0.5‚3 M). The differential spectra, derived from the consequent Raman spectra, have reflected the substantial discrepancy between the spectra of lanthanide (III) salt solutions and pure water as well as the spectra of standard LiCl (C~1.5‚9M) solutions. The new sharp bands (ν max ~ 3180‚3190 cm -1 ) and (ν max~3 360 cm -1 ), observed in the differential spectra, are assumed to two types of aqua-ions: Ln 3+
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