Experimental N V and Ne VIII low-temperature dielectronic recombination rate coefficients

The dielectronic recombination rate coefficients of $\ion{N}{v}$ and $\ion{Ne}{viii}$ ions have been measured at a heavy-ion storage ring. The investigated energy ranges covered all dielectronic recombination resonances attached to $2{\rm s} \rightarrow 2{\rm p}$ ($\Delta n=0$) core excitations. The rate coefficients in a plasma were derived and parameterized by using a convenient fit formula. The experimentally derived rate coefficients were then compared to theoretical data. In addition the influence of external electric fields with field strengths up to 1300 V/cm on the dielectronic recombination rate coefficient was investigated