The FTIR and FTRaman spectra were taken for polycrystalline samples of isoo
rotic acid and its alkali metal salts. For the isoorotic acid the low tempe
rature Ar-matrix IR spectrum was also registered and analysed. Assignment o
f the selected experimental vibrational bands was supported by the MP2/3-21
G(++) calculated vibrational spectra and the potential energy distribution
analysis. Influence of type of the alkali metal on the spectra is also disc
ussed, (C) 2001 Elsevier Science B.V. All rights reserved.