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  • 1 Hungarian Academy of Sciences at Eötvös L. University Budapest Research Group for Nuclear Techniques in Structural Chemistry H-1518 Budapest P.O. Box 32 Hungary
  • 2 KFKI Research Institute for Particle and Nuclear Physics H-1525 Budapest P.O. Box 49 Hungary
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Nuclear inelastic resonant scattering of synchrotron radiation was applied to the study solutions of 57Fe complexes. In order to reveal different inelastic contributions solutions of two different 57Fe complexes of different molecular dimensions with solvents of substantially different viscosities were studied. We argue that the only former experiment available in the literature overestimates the role of the diffusivity in affecting the spectrum. The first direct observation of an intramolecular vibrational transition assisting the nuclear resonance absorption in a liquid is reported.