# Access via laboratory experiments to the level mixing effect induced by blackbody radiation and its influence on the cosmological hydrogen recombination problem

## TL;DR

This paper investigates how blackbody radiation causes atomic level mixing and line broadening, affecting cosmological hydrogen recombination, with laboratory experiments proposed to distinguish effects and assess their impact on early universe models.

## Contribution

It introduces a detailed analysis of level mixing effects induced by blackbody radiation and proposes experimental methods to distinguish it from other broadening mechanisms.

## Key findings

- Level mixing significantly contributes to line broadening.
- Laboratory experiments can differentiate between mixing and Raman scattering effects.
- Level mixing influences the recombination history of primordial plasma.

## Abstract

An effect of atomic line broadening induced by the blackbody radiation is discussed. The level mixing effect and anti-Stokes Raman scattering are compared. It is shown that the mixing effect gives the most significant contribution to the line broadening and it is indicated how to distinguish these two effects in laboratory experiments. The influence of the level mixing on the recombination history of primordial plasma is also discussed.