Distorted-wave calculations of dielectronic recombination forC3+andO5+in small electric fields

The dielectronic recombination cross sections associated with the 2s→2p transition in Li-like carbon and oxygen ions in the presence of small electric fields have been calculated in the distorted-wave approximation. By convoluting the product of the electron velocity and the theoretical cross section with the experimental velocity distribution, we compare our calculations with recent measurements of high-resolution recombination rates 〈vσ(v)〉 by Andersen et al. With the exception of the magnitude of the low-energy peak due to the 2p4l resonances, the agreement between experiment and theory is excellent in ${\mathrm{C}}^{3+}$ for a field in the interaction region of just over 3 V/cm. In the case of ${\mathrm{O}}^{5+}$, however, there is good agreement between experiment and theory for the low-Rydberg states, but there appear to be discrepancies between the measured rates and the theoretical rates for the high-Rydberg states, where the effects of fields are important.