A new preparing technique of polycrystalline thin films of orthoboric acid is introduced. It is possible to obtain better i.r. spectra of crystalline H3BO3 if boric acid is converted into B2O3 by dehydration in vacuum and then subjected to slow rehydration. The various stages of preparation are verified by i.r. spectra. The i.r. spectra of H3BO3 arerecorded at 30°C and at -196°C. The spectral changes are examined starting by i.r. and neutron diffraction searches of low temperature hydrogen bonding solids and are interpreted in basis of the changes of the hydrogen bond $O-H \cdots O$ strength that occur at low temperature.
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Con il contributo del Ministero per i Beni e le Attività Culturali