We report on measurement of secondary-electron emission (SEE) induced by hydrogen clusters (Hₙ⁺, n{≤}19, odd) from thin carbon foils for beam velocities above and around the Bohr velocity. The n dependence of the SEE yield shows a strong inhibition effect with respect to the atomic case. At a given velocity, the inhibition effect is observed first to increase with n and then to reach a saturation value (n{≥}7). These results are connected to the understanding of the inhibition effects observed with molecular beams.
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Faria et al. (1992) studied this question.
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