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This work presents a quantitative comparison between experiment and molecular dynamics simulations for the excitation spectra of large van der Waals clusters. The emission and excitation spectra of mixed Ba(Ar)n clusters have been obtained for average cluster sizes ranging between 300 and 4000. The simulation is performed by using classical dynamics and pairwise additive potentials for two cases corresponding to the barium atom at the surface or inside the argon cluster. A very good agreement with the experiment is found when the barium atom is at the surface.

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Laser light scattering, associated with molecular beam flux measurements, provide an easy to perform, sensitive, non-destructive technique for the determination of relative mean sizes of molecular clusters in molecular beams formed with different expansion conditions. The results are compared to an absolute method used in the authors' laboratory and show good agreement in the range investigated (n approximately=150-4000).