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Coincidence experiment concerning the origin of convoy electrons produced by swift deuterium beams traversing carbon foils

1986; American Institute of Physics; Volume: 33; Issue: 3 Linguagem: Inglês

10.1103/physreva.33.2160

0556-2791

M. G. Menendez, M. M. Duncan, S. D. Berry, I. A. Sellin, W. Meckbach, P. Focke, I. B. Nemirovsky,

Mass Spectrometry Techniques and Applications

We have measured convoy electrons produced by the passage of deuterium particles through thin carbon foils in coincidence with emerging particles in both charge states, ${\mathrm{D}}^{+}$ and ${\mathrm{D}}^{0}$. The energy spectrum of electrons coincident with emerging ${\mathrm{D}}^{+}$ ions exhibits the characteristic convoy-electron cusp shape centered about the projectile velocity. The energy spectrum of electrons coincident with emerging ${\mathrm{D}}^{0}$ particles also exhibits a peak at the projectile velocity, but its shape appears to be qualitatively different from the e-${\mathrm{D}}^{+}$ coincidence spectrum. We suggest that e-${\mathrm{D}}^{0}$ coincidences are the result of neutralization of ${\mathrm{D}}^{+}$ particles (accompanied by convoy electrons) between the sites of congies and agree very well with recent measurements, in the energy range where channel coupling and autoionizing transitions are not important. Comparison is also made with a calculation carried out within the local-density random-phase approximation.