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  Journal of Spectroscopy and Dynamics 2014, 4: 20
  Research Article
FT-IR, FT-Raman, concentration dependent SERS and quantum chemical study of L-aspartic acid
  K. Jalajaa,e, K. Viswanathana, Hema Tresa Vargheseb, C. Yohannan Panickerc, P. L. Antod  
a Department of Physics, Karpagam University, Eachanari, Coimbatore, Tamilnadu, India
b Department of Physics, Fatima Mata National College, Kollam, Kerala, India
c Department of Physics, TKM College of Arts and Science, Kollam, Kerala, India
d Department of Physics, Christ College, Irinjalakkuda, Thrissur, Kerala, India
e Department of Physics, IES College of Engineering, Chittialappilly, Thrissur, Kerala, India

  The IR, Raman and concentration dependent SERS spectra of L-aspartic acid were studied. The wavenumbers were calculated theoretically using Gaussian09 software package at the B3LYP/SDD level. The observed wavenumbers were found to be in agreement with the calculated values. The surface enhanced Raman scattering spectra were recorded in a silver colloid at different concentrations. Of the spectra at different concentrations, the SERS spectrum at 10-3 M solution is the prominent one. The presence of COOH and NH2 modes in the SERS spectrum reveals significant metal-molecule interaction. As concentration changes, the orientation of the molecule with respect to the metal surface also varies which is evident from the appearance and disappearance of vibrational modes of different groups of the title compound.
  FT-IR; FT-Raman; SERS; Silver colloid; Aspartic acid  

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