Dielectronic recombination from the ground state of heliumlike carbon ions
1993; American Physical Society; Volume: 47; Issue: 6 Linguagem: Inglês
10.1103/physreva.47.4859
ISSN1538-4446
AutoresG. Kilgus, D. Habs, D. Schwalm, A. Wolf, R. Schuch, N. R. Badnell,
Tópico(s)Advanced Chemical Physics Studies
ResumoThe cross section for dielectronic recombination of ${\mathrm{C}}^{4+}$ ions in the 1${\mathit{s}}^{2}$ ground state has been measured with an energy resolution of \ensuremath{\approxeq}2 eV at the heavy-ion storage ring TSR (at Heidelberg) up to the 1s2s${(}^{1,3}$S) and 1s2p${(}^{1,3}$P) excitation thresholds just below 310 eV. Resonance energies and absolute cross sections are found to be well reproduced by theoretical calculations except in a region extending \ensuremath{\approxeq}5 eV below the almost degenerate excitation thresholds 1s2s${(}^{1}$S) and 1s2p${(}^{3}$P). These discrepancies imply that theory overestimates the cross section, energy-integrated over all dielectronic resonances, by \ensuremath{\approxeq}10%.
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