On the effect of collisional transitions on the cosmological hydrogen recombination spectrum

Details On the effect of collisional transitions on the cosmological hydrogen recombination spectrum On the effect of collisional transitions on the cosmological hydrogen recombination spectrum

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006astl...32..507b&link_type=abstract

Astronomy Letters, vol. 32, Issue 8, p.507-513

Astronomy and Astrophysics

Astronomy

1

Pacs Numbers 95.30.Dr - 98.70.Vc - 98.80.-K

Scientific paper

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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