Abstract
We study the effect of collisional 2s ↔ 2p transitions on the populations of the 2s and 2p states at the cosmological hydrogen recombination epoch and on the intensity of the recombination Hα line. Our calculations are based on a simple model hydrogen atom with four bound states (1s, 2s, 2p, and the n = 3 level with an equilibrium distribution in sublevels with different orbital quantum numbers l). We show that collisions do not lead to an equilibrium distribution in sublevels of the n = 2 level. The relative change in the cosmological Hα line intensity due to collisional transitions does not exceed 10−3.
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Original Russian Text © M.S. Burgin, V.L. Kauts, N.N. Shakhvorostova, 2006, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2006, Vol. 32, No. 8, pp. 563–569.
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Burgin, M.S., Kauts, V.L. & Shakhvorostova, N.N. On the effect of collisional transitions on the cosmological hydrogen recombination spectrum. Astron. Lett. 32, 507–513 (2006). https://doi.org/10.1134/S1063773706080019
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DOI: https://doi.org/10.1134/S1063773706080019