Collision statistics of clusters: From Poisson model to Poisson mixtures

Details Collision statistics of clusters: From Poisson model to Poisson mixtures Collision statistics of clusters: From Poisson model to Poisson mixtures

2009-08-23

arxiv.org/abs/0908.3047v1

Chin. Phys. B Vol. 19, No. 2 (2010) 023602

Physics

Chemical Physics

22 pages, 4 figures, to appear in Chin Phys B

Scientific paper

Clusters traverse a gas and collide with gas particles. The gas particles are adsorbed and the clusters become hosts. If the clusters are size selected, the number of guests will be Poisson distributed. We review this by showcasing four laboratory procedures that all rely on the validity of the Poisson model. The effects of a statistical distribution of the cluster sizes in a beam of clusters are discussed. We derive the average collision rates. Additionally, we present Poisson mixture models that involve also standard deviations. We derive the collision statistics for common size distributions of hosts and also for some generalizations thereof. The models can be applied to large noble gas clusters traversing doping gas. While outlining how to fit a generalized Poisson to the statistics, we still find even these Poisson models to be often insufficient.

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