Abstract
The electron emission yield induced by mega-electron-volt ${\mathrm{H}}^{+}$, ${\mathrm{He}}^{2+}$, ${\mathrm{Li}}^{3+}$, ${\mathrm{B}}^{5+}$, and ${\mathrm{C}}^{6+}$ impact on aluminum, copper, and gold targets was measured. We found a significant deviation of the results from a simple proportionality to the stopping power, especially for heavier ions and low projectile velocities. Using a slightly modified model by J. E. Borovsky and D. M. Suszcynsky [Phys. Rev. A 43, 1433 (1991)] our experiments could be well represented. In this model the collective electric field generated along the projectile's path was taken into account. Consequently, the positive ion channel appears to be the dominant mechanism that leads beyond a projectile-independent yield--to--stopping power ratio.
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