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Description
The level-resolved radiative recombination (RR) rate coefficients for H-like to Na-like ions from H (Z=1) up to and including Zn (Z=30) are studied here. For H-like ions, the quantum-mechanical exact photoionization cross sections for nonrelativistic hydrogenic systems are used to calculate the RR rate coefficients under the principle of detailed balance, while for He-like to Na-like ions, the archival data on ADAS are adopted. Parameterizations are made for the direct capture rates in a wide temperature range. The fitting accuracies are better than 5% for about 99% of the ~3x10^4^ levels considered here. The ~1% exceptions include levels from low-charged many-electron ions, and/or high-shell (n>~4) levels are less important in terms of interpreting X-ray emitting astrophysical plasmas. The RR data will be incorporated into the high-resolution spectral analysis package SPEX.
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