Group Theory Analysis of Lattice Vibrations and Raman Spectrum of the K₂La（NO₃）₅. 2H₂O Crystal

Lattice vibrations of the K₂La（NO₃）₅. 2H₂O crystal arc analysed with the aid of group theory. The vibrations of species are given. They are 42A₁+42A₂+45B₁+45B₂. The A₁, B₁ and B₂ arc acoustic modes. The 41A₁, 42A₂, 44B₁ and 44B₂ modes are Raman active. The 4lAI、44B₁. 44B₂ modes are IR active. The Raman spectra of the crystal are observed in different grometric configrations. The experiment results arc analyst and discussed.