Abstract
Total yields for ion-induced electron emission from atomically clean polycrystalline gold have been measured with an accuracy of ≤ ±5% for normal incidence of C q+ ( q ≤ 5), N q+ ( q ≤ 6), O q+ ( q ≤ 7), and Ne q+ ( q ≤ 9) at impact velocities from the exclusive potential emission (PE) regime up to 10 6 m/s (≈5 keV/amu). The contribution by kinetic emission (KE) to these total electron yields, which is commonly assumed as independent of projectile charge, can be estimated by subtracting the respective PE contribution after precise determination of KE impact velocity thresholds for the corresponding singly charged ions. At given projectile atomic number and impact velocity we have searched for a possible q dependence of the KE yield. For 1 ≤ q ≤ 3 the KE yields decrease slightly with increasing q, whereas no significant q dependence could be found for higher charged ions. These results are discussed by regarding the q dependencies of two different mechanisms which are believed to be relevant for KE.
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