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Using the R-matrix method, we carry out theoretical calculations for recombination line λ 8794 Å(3d'-3p') of C_II, which is important to estimate the abundances of carbon in planetary nebulae. Our calculations are based on three sets of target orbital basis, through which we elucidate the electron correlation and static polarization effects in the dielectronic recombination processes.

The NO molecule in Rydberg states consists of a closed shell molecular ion and an excited electron in a Rydberg molecular orbital. It is a comparatively simple but non-trivial excited molecule. Here, we present our theoretical calculation of the quantum defects of these Rydberg states. The theoretical results are in good agreement with the experimental data.