title: A new approach to explain concentration-dependent changes of isotropic Raman line width in the associated binary mixtures.
abstract: We report on a new empirical relationship to explain the concentration-dependent isotropic Raman line width changes of a vibrational mode in uniform binary mixtures. The factors contributing to the intrinsic line width and several other broadening mechanisms are, in general, concentration-dependent. Concentration fluctuation in a microscopic volume and microviscosity are the two factors that are known to cause a concentration-dependent line width variation. These two factors combined in a specific manner successfully explain the variation of the line width with concentration strongly associated with binary systems. A readily usable empirical relationship for line width is suggested. It has been demonstrated that it can successfully explain the line width variation with concentration in a given class of hydrogen-bonded systems taking some representative binary mixtures.
authors.affiliation: Department of Physics, Banaras Hindu University, Varanasi-221005, India.
authors.forename: Animesh K
authors.initials: AK
authors.lastname: Ojha
authors.forename: Sunil K
authors.initials: SK
authors.lastname: Srivastava
authors.forename: Ranjan K
authors.initials: RK
authors.lastname: Singh
authors.forename: B P
authors.initials: BP
authors.lastname: Asthana