Shaumeyer JN, Briggs ME, Gammon RW. Statistical fitting accuracy in photon correlation spectroscopy.
APPLIED OPTICS 1993;
32:3871-3879. [PMID:
20830019 DOI:
10.1364/ao.32.003871]
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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%.
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