The effect of collisional transitions 2s <-> 2p on the population of states 2s and 2p at the epoch of cosmological recombination of hydrogen and on the intensity of recombination line H_alpha is studied. The calculations are performed in the framework of simple model of hydrogen atom with four bound states: 1s, 2s, 2p, and the level n=3 with equilibrium distribution over sublevels with different values of angular momentum l. It is shown, that the collisions don't lead to equilibrium distribution over sublevels of the level n=2. The relative change in the intensity of cosmological line H_alpha due to effect of the collisions is less than 10^-3.

Page created on February 26, 2006.