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We have studied the radiative decay of the 2s state of one-electron andone-muon ions, where the two-photon mechanism plays an important role. Due tothe nuclear size corrections the radiative decay of the 2s state in theelectron and muon ions is qualitatively different. Based on the accuraterelativistic calculation, we introduced a two-parameter approximation, whichmakes it possible to describe the two-photon angular-differential transitionprobability for the polarized emitted photons with high accuracy. The emissionof photons with linear and circular polarizations was studied separately. Wealso investigated the transition probabilities for the polarized initial andfinal states. The investigation was performed for ions with atomic numbers 1 <Z < 120.

Investigation of two-photon 2s -> 1s decay in one-electron and one-muon ions