Triple-differential probabilities for the emission ofδelectrons in 10-MeVFq++Ne (q=6,8,9)

Absolute triple-differential probabilities for the emission of $\delta$ electrons in the near-symmetric collision system 10-MeV ${\mathrm{F}}^{q+}+\mathrm{Ne}$, for $q=6,8\mathrm{}$, and $9$, have been measured as a function of the impact parameter, the $\delta$-electron energy, and the $\delta$-electron emission angle. The impact-parameter dependence of these probabilities features for all observed collision systems, electron energies, and emission angles a sharp rise to a constant maximum at about 1.5 times the neon $K$-shell radius $r_K$ and fall off for impact parameters $b>\mathrm{}{r}_K$ somewhat exponentially with increasing electron energy. For an electron emission at 52.5° with respect to the beam axis this energy dependence is distorted by the occurrence of a binary-encounter peak. The $\delta$-electron emission probabilities show a strong asymmetry for electrons emitted in forward beam direction. A comparison of the experimental data obtained in 10-MeV ${\mathrm{F}}^{9+}$ + Ne at an electron emission angle of 90° with a recent semiclassical-approximation-type calculation shows discrepancies in both the impact-parameter dependence and in magnitude of the emission probabilities. However, the energy dependence is reproduced reasonably well in this model.