title: Statistical fitting accuracy in photon correlation spectroscopy.
abstract: Continuing our experimental investigation of the fitting accuracy associated with photon correlation spectroscopy, we collect 150 correlograms of light scattered at 90° from a thermostated sample of 91-nm-diameter, polystyrene latex spheres in water. The correlograms are taken with two correlators: one with linearly spaced channels and one with geometrically spaced channels. Decay rates are extracted from the single-exponential correlograms with both nonlinear, least-squares fits and second-order cumulant fits. We make several statistical comparisons between the two fitting techniques and verify an earlier result that there is no sample-time dependence in the decay rate errors. We find, however, that the two fitting techniques give decay rates that differ by 1%.
authors.forename: J N
authors.initials: JN
authors.lastname: Shaumeyer
authors.forename: M E
authors.initials: ME
authors.lastname: Briggs
authors.forename: R W
authors.initials: RW
authors.lastname: Gammon