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A theoretical model based on the method of super transition arrays (STA) isused to compute the emissivities, opacities and average ionization states ofcarbon (C) and polystyrene (CH) plasmas in the warm-dense matter regime inwhich the coupling constant varies between 0.02 to 2.0. The accuracy of resultsof STA calculations is assessed by benchmarking against the availableexperimental data and results obtained using other theoretical methods,assuming that a state of local thermodynamic equilibrium exists in the plasma.In the case of a carbon plasma, the STA method yields spectral features thatare in reasonably-good agreement with Dirac-Fock and Hartree-Fock-Slatertheories; in the case of CH, we find that STA-derived opacities are verysimilar to those derived using quantum-molecular-dynamics density-functionaltheory and Hartree-Fock method down to plasma temperature of about 20 eV. Ourcalculations also compare favorably with available experimental measurements ofGamboa {\it et al} [High Energy Density Phys. {\bf 11}, 75 (2014)] of theplasma temperature and average ionization state behind a blast wave in a purecarbon foam. Although the STA-computed average-ionization charge state in therarefaction region appears to be lower than the experimental data, it is withinthe experimental uncertainty and the discrepancy is nevertheless consistentwith results reported using an atomic kinetic model. In addition, we furtherpredict the temperature dependence of average ionization states of CH plasma inthe same temperature range as for the carbon plasma.

Radiative and atomic properties of C and CH plasmas in the warm-dense matter regime