Abstract
The effective cross section, σ eff, for ionization by electrons of molecules in hydrogen cluster beams is measured in the energy range from 30 to 500 eV. The mean cluster size is varied from N ≈ 340 up to N = 85000 molecules per cluster. For N ⩾ 8000 the energy dependence of σ eff shows two humps at ≈ 180 eV and ≈ 260 eV respectively which have not been observed in previous measurements of the ionization cross section of clusters. The result is explained in terms of a simple model developed previously. From the dependence of the ionization cross section of clusters on their size we conclude that the average escape depth of secondary electrons is 5.5 molecular diameter.
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