Abstract
Number distributions of secondary electrons emitted from a Au metal surface have been measured for atomic and molecular ions of H +, He +, C +, N +, O +, H + 2, H + 3, HeH +, CO + and O + 2 in the energy range 0.3–2.0 MeV. The emission statistics obtained are described fairly well by a Pólya function. The Pólya parameter b, determining the distribution shape, is found to decrease monotonously with increasing emission yield γ, revealing a surprising relationship of bγ∼1 over the different projectile species and impact energies. This finding supports certainly the electron cascading model. Also we find a strong negative molecular effect for heavier molecular ions, showing a significant reduction of γ compared to the estimated values using constituent atomic projectile data.
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