Doppler Shifts in Light Scattering. II. Flexible Polymer Molecules

Abstract

The light-scattering spectrum for the bead-and-spring model of flexible polymers is computed. The spectrum is shown to consist of a sum of Lorentzians centered about the incident frequency each with a half-width proportional to the relaxation time of a given normal mode. The contribution of each normal mode to the spectrum is proportional to the ratio of the equilibrium mean-squared length of a mode to the square of the incident-light wavelength.