Fig. 1.
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Characteristic lifetime of the hydrogen atom in the excited states 2s and 2p (
, 
), time intervals between following recombinations to the base and excited levels (
, 
), and the resulting photoionization (
, 
) by CMBR (at z > 200) as well as the first light photons (z < 30). The computations are made for the cosmological model with Planck 2018 parameters and thermal models of the first light.
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