On the apparently fixed dispersion of size distributions

Details On the apparently fixed dispersion of size distributions On the apparently fixed dispersion of size distributions

2010-09-17

arxiv.org/abs/1009.3337v1

Journal of Computational and Theoretical Nanoscience, 8(4), 598-602 (2011)

Physics

Data Analysis, Statistics and Probability

15 pages, preprint, to appear in Journal of Computational and Theoretical Nanoscience

Scientific paper

10.1166/jctn.2011.1728

Probability density functions (PDF) of statistical distributions of cluster sizes N, where N is the number of particles in the cluster, often seem to have less freedom than expected from considering the number of degrees of freedom at the clusters' source. The full width at half maximum appears to be comparable to the average . Such a hidden symmetry is intriguing theoretically and practically impairs size selection towards narrow distributions. However, reviewing the example of Helium cluster beams demonstrates that the origin of the apparent fixing is the assumption that the distributions should be log-normal or exponential and the subsequent use of these functions to fit the data in n = ln(N) log-space. This demands more care when using parametric statistics. Alternatives to the traditionally employed fitting functions are discussed.

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