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(n,l)−Subshell electron capture cross sections in collisions of C4+, N5+ and O6+ with atomic hydrogen

1985; Elsevier BV; Volume: 9; Issue: 4 Linguagem: Inglês

10.1016/0168-583x(85)90334-9

1872-9584

D. Dijkkamp, D. Ćirić, F J de Heer, Elias Vlieg,

Plasma Diagnostics and Applications

Abstract By means of VUV-photon spectroscopy we have determined absolute Subshell selective electron capture cross sections σnlfor collisions of helium-like carbon, nitrogen and oxygen ions with atomic hydrogen, in the velocity range 0.1–0.5 a.u. The atomic hydrogen beam target was produced by means of a radio-frequency discharge source, and absolutely calibrated by measuring atomic and molecular radiation in the visible region produced by electron impacts. For all systems studied we find that the total capture cross section (σt = Σnlσnl depends only weakly on the impact velocity, and is in good agreement with published results from other authors. In contrast to σt, the Subshell selective cross sections σnl are strongly velocity dependent. Our results are compared with recent calculations by Fritsch and Lin; the agreement is quite satisfactory.