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- W2074187485 abstract "The charge-state dependence of the binary-encounter-electron (BEE) double-differential cross section (DDCS) at 0ifmmode^circelsetextdegreefi{} with respect to the beam direction resulting from collisions of 1 MeV/amu ${mathrm{H}}^{+}$, ${mathrm{C}}^{mathit{q}+}$, ${mathrm{N}}^{mathit{q}+}$, ${mathrm{O}}^{mathit{q}+}$, ${mathrm{F}}^{mathit{q}+}$, ${mathrm{Si}}^{mathit{q}+}$, and ${mathrm{Cl}}^{mathit{q}+}$, and 0.5 MeV/amu ${mathrm{Cu}}^{mathit{q}+}$ with ${mathrm{H}}_{2}$ is reported. The data show an enhancement in the BEE DDCS as the charge state of the projectile is decreased, in agreement with the data reported by Richard et al. [J. Phys. B 23, L213 (1990)]. The DDCS enhancement ratios observed for the three-electron isoelectronic sequence ${mathrm{C}}^{3+}$:${mathrm{C}}^{6+}$, ${mathrm{N}}^{4+}$:${mathrm{N}}^{7+}$, ${mathrm{O}}^{5+}$:${mathrm{O}}^{8+}$, and ${mathrm{F}}^{6+}$:${mathrm{F}}^{9+}$ are about 1.35, whereas a DDCS enhancement of 3.5 was observed for ${mathrm{Cu}}^{4+}$. The BEE enhancement with increasing electrons on the projectile has been shown by several authors to be due to the non-Coulomb static potential of the projectile and additionally to the e-e exchange interaction. An impulse-approximation (IA) model fits the shape of the BEE DDCS and predicts a ${mathit{Z}}_{mathit{p}}^{2}$ dependence for the bare-ion cross sections. The IA also predicts a binary peak energy that is independent of q and ${mathit{Z}}_{mathit{p}}$ and below the classical value of 4t, where t is the energy of electrons traveling with the projectile velocity. We observed a BEE energy shift ensuremath{Delta}E (ensuremath{Delta}E=4t-${mathit{E}}_{mathrm{peak}}$, where ${mathit{E}}_{mathrm{peak}}$ is the measured energy at the peak of the binary encounter electrons) that is approximately independent of q for the low-${mathit{Z}}_{mathit{p}}$ ions, whereas the measured ensuremath{Delta}E values for Si, Cl, and Cu were found to be q dependent." @default.
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- W2074187485 date "1993-12-01" @default.
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- W2074187485 title "Charge-state dependence of binary-encounter-electron cross sections and peak energies" @default.
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- W2074187485 doi "https://doi.org/10.1103/physreva.48.4421" @default.
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