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The effect of a diluted Planckian radiation field on a Xe gas at the electrontemperature of 100 eV is investigated within the framework of a CollisionalRadiative Model, using the HULLAC code. The atomic model spans 19 chargestates, includes 20 375 configurations and contains more than 2 10^6 levels. Wehave simulated detailed spectra comprising more than 10^9 transitions with theMixed UTA model. The radiation temperature Tr is varied from 0 to 1.5 Te. Thedilution factor, D, applied to decrease the radiation field, is variedindependently from 0 to 3 at fixed Tr = Te. In both cases, the average chargestate Z* increases from 15 to 27, but in different ways. It is shown that evena dilution D = 0.01 changes Z* by more than 1.5. Different combinations of Trand D yielding exactly the same Z*, may give line ratios sufficiently differentto be observed. This fact is explained by the interplay of the shape of theradiation field and the atomic structure.

Effect of incoming radiation on the non-LTE spectrum of Xe at Te = 100 eV