Abstract
We consider the possibility of population inversion in astrophysical objects irradiated by high-intensity black-body radiation from a nearby source. As a model, we use the 1s2p $^{1}$P$_{1}$ populations in helium-like ions, which are generated by K-shell photoionization of lithium-like ions. Our conclusion is that the presently known highest astrophysical irradiation conditions are insufficient to produce population inversion for this transition. According to our estimate, population inversion is possible only in the visible or longer wavelength regimes. Our estimates may change for non-black-body radiation distributions.
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