The present study is dedicated to the investigation of the measured spatial (or temporal) and spectral intensity profiles behind a CO2-N2 mixture moving shock. The experimental data are provided by recent spectroscopic measurements carried out on shock tubes operating at various operating conditions representative of Mars entries. Absolute measurements of the radiation in the peak and in the plateau regions, mainly due to CO Fourth Positive, C2 Swan and CN Violet systems, are compared with radiative signatures rebuilt in the frame of chemical non equilibrium and two temperatures assumptions. Also two different chemical kinetic models are considered for the flowfield features prediction. The agreement with CN radiation experimental intensity profiles was found to be acceptable for the two models, except for high pressure case indicating the possible contribution of three body mechanism which might be important in atmospheric plasmas. Comparisons with measured C2 radiation intensity profiles have shown significant limitations for the most recent chemistry. A detailed analysis of the chemical processes contributing to the C2 production and loss is also proposed to interpret the considerable observed deviation between the two predicted C2 relaxation dynamic.