Dielectronic recombination resonances in ${\mathrm{F}}^{6+}$

Electron-ion recombination spectra of the Li-like ion ${\mathrm{F}}^{6+}$ in the energy range $0.0-0.6\hspace{0.5em}\mathrm{eV}$ from two different ion storage rings are presented, showing excellent agreement. The experimental results are compared with a calculated spectrum, obtained by combination of relativistic many-body methods and complex rotation, and the agreement is found to be very good. The recombination spectrum in the studied energy region is determined by the ${2p}_{j}6{\mathcal{l}}_{j^{\prime }}^{\prime }$ dielectronic recombination resonances. The lowest-energy resonances are found around 10 meV, and include one broad resonance overlapping the threshold. The recombination rate coefficients are, even in this region, very well accounted for by the calculation. It is further shown that the nonrelativistically allowed resonances contribute to less than 60% of the integrated rate coefficients in the specified energy range.