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Revisiting the method of cumulants for the analysis of dynamic light-scattering data

机译:再次探讨用于动态光散射数据分析的累积量方法

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摘要

The method of cumulants is a standard technique used to analyze dynamic light-scattering data measured for polydisperse samples. These data, from an intensity-intensity autocorrelation function of the scattered light, can be described in terms of a distribution of decay rates. The method of cumulants provides information about the cumulants and the moments of this distribution. However, the method does not permit independent determination of the long-time baseline of the intensity correlation function and can lead to inconsistent results when different numbers of data points are included in the fit. The method is reformulated in terms of the moments about the mean to permit more robust and satisfactory fits. The different versions of the method are compared by analysis of the data for polydisperse-vesicle samples.
机译:累积量的方法是一种标准技术,用于分析为多分散样品测得的动态光散射数据。来自散射光的强度-强度自相关函数的这些数据可以用衰减率的分布来描述。累积量的方法提供有关累积量和此分布时刻的信息。但是,该方法不允许独立确定强度相关函数的长期基线,并且当拟合中包含不同数量的数据点时,可能导致结果不一致。根据关于平均值的矩来重新定义该方法,以实现更稳健和令人满意的拟合。通过分析多分散囊泡样品的数据,比较了该方法的不同版本。

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