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  Global Journal of Analytical Chemistry 2012, 3: 14
  Research Article Free Article
IR, Raman, Surface enhanced Raman Scattering (SERS) and computational study of L-phenylalanine
  Shyma Mary.Ya, Sheena Mary.Ya, Hema Tresa Varghesea, C.Yohannan Panickerb,c, P.J.Jojoa,d  
aDepartment of Physics, Fatima Mata National College, Kollam, Kerala, India
bDepartment of Physics, TKM College of Arts and Science, Kollam, Kerala, India
cDepartment of Physics, Research Centre, Mar Ivanios College, Nalanchira, Trivandrum, Kerala, India
dpresent address: Department of Physics, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia

  The FT-IR, FT-Raman and SERS spectra of L-phenylalanine on Klarite® substrates from Renishaw Diagnostics were studied. The molecular geometry and wavenumbers have been calculated theoretically. The presence of in-plane and out-of-plane modes of the phenyl ring in the SERS spectra suggest a tilted orientation of the molecule with respect to the metal surface. The presence of NH2, CH2 and COOH group vibrations in the SERS spectra show the interaction between these groups and the metal surface. The first hyperpolarizability, predicted infrared intensities and Raman activities are reported. The calculated first hyperpolarizability value suggests that the title compound is an attractive object for future studies of nonlinear optics.
  SERS; Klarite® substrates; Phenylalanine; Hyperpolarizability  

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