title: Vibrational dephasing and hydrodynamic effects on vibrational relaxation rates in acetophenone: Raman bandshape analysis.
abstract: The isotropic component of Raman band for C=O stretching mode of acetophenone in solution was analyzed by estimating the correlation coefficient with reference to Lorentzian lineshape. In the intermediate region of solute/solvent concentration there is a sharp decrease in the correlation coefficient and there appears to be a transition from non-Lorentzian to Lorentzian lineshape. The vibrational relaxation rates have been estimated from the isotropic component of Raman band in different solvents. The rate is shown to be dependent on several macroscopic as well as microscopic properties of the solute-solvent system and intermolecular interactions. The hydrodynamic and dispersion forces appear to play a major role in determining the vibrational relaxation rate and the broadening of the bands.
authors.affiliation: Department of Physics, North Eastern Hill University, Shillong 793022, Meghalaya, India.
authors.forename: Soma
authors.initials: S
authors.lastname: Datta
authors.forename: Kamal
authors.initials: K
authors.lastname: Kumar
mesh_terms: D000098:Acetophenones / Q000737:chemistry*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D007700:Kinetics; D008958:Models, Molecular; D008968:Molecular Conformation; D013059:Spectrum Analysis, Raman; D014732:Vibration
chemical_list: D000098:Acetophenones; C038699:acetophenone