Abstract
Electron capture by ${\mathrm{O}}^{7,8+}$ and ${\mathrm{N}}^{7+}$ in collisions with He at 0.2--1.7 a.u. was investigated using coincident recoil momentum spectroscopy. The Q values and angular differential cross sections for single capture, transfer ionization (TI), and double capture (DC) were measured. Our Q-value measurements indicate that the electrons are captured into less tightly bound states with increasing collision velocity. The Q values and angular differential cross sections for DC and TI by ${\mathrm{O}}^{8+}$ are approximately the same, while those for DC and TI by ${\mathrm{O}}^{7+}$ and ${\mathrm{N}}^{7+}$ differ significantly. Our analysis indicates that the population of very asymmetric states (n=2, n'>10) is necessary to explain this difference.
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