Abstract
The relativistic multichannel theory has been applied and a nonperturbativeformula adopted to calculate the dielectronic recombination cross sectiondue to ΔN = 1 resonances for the ground state C4+. Thefirst-order approximation is adopted for the radiative process and acorrection based on the isolated resonance approximation is used for thevery narrow resonances to include the radiation width. The convoluted crosssection is in agreement within 5% with that of observation for resonanceswith n⩽5. For n = 6 and 7, the integral cross section isoverestimated by a factor of 6 and 4, respectively. According to ourcalculation, the Rydberg cut-off due to field ionization should be at aprincipal quantum number higher than that given by Mannervik et al. Asmall relativistic effect is noticed at intrashell resonance.
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