E. E. Kholupenko, A. V. Ivanchik, D. A. Varshalovich
Ioffe Physico-Technical Institute, Politekhnicheskaya 26, St.Petersburg 194021, Russia
Recombination of the primordial helium plasma (HeII → HeI) is considered. This process has an effect on CMBR anisotropy and CMBR spectrum distortion. In this work an influence of neutral hydrogen on kinetics of HeII → HeI recombination is investigated in the frame of standard cosmological model. It is shown that small amount of neutral hydrogen at the epochs z=1500 - 3000 leds to acceleration of HeII → HeI recombination and at the epoch z ∼ 1700 quasi-equilibrium HeII → HeI recombination (according to the Saha formula) becomes valid.
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