Abstract
Low-temperature Raman spectra of pure, and alanine doped triglycine sulphate (TGS) crystals in the low-frequency range ν<400 cm−1 are reported. Substantial changes in the relative intensity of several modes occur whereas the band positions remain largely unchanged. Doping induced relative intensity changes are correlated with the change in H-bonding and molecular reorientation. Results indicate that alanine replaces G(I) mainly at low-dopant concentration. However, doping causes reorientation of all the three ions.
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