EIT phenomenon for the three-level hydrogen atoms and its application to the era of cosmological recombination

Дубрович, В. К.

doi:10.2478/s11534-014-0452-0

Cited by 2 publications

(3 citation statements)

References 17 publications

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“…This paper employs the threelevel approximation for the atom. Within the theory [7][8][9][10][11], the imaginary part of a density matrix element fails to correspond to the isolated transition and strongly depends on the field parameters defined for the adjacent resonance, see equation (5). The component with the poorest accuracy is taken from [21].…”

Section: Analysis Of Resultsmentioning

confidence: 99%

“…Recently, the density matrix formalism was applied to study the effect of Electromagnetically-Induced Transparency (EIT) in hydrogen atom under the conditions corresponding to the recombination era of the universe [7,8]. It was shown that the EIT phenomenon could lead to corrections on the order of 1% in the observed cosmic microwave background (CMB).…”

Section: Correction To the Optical Depth Via The Evaluation Of Three-...mentioning

confidence: 99%

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Analysis of the absorption line profile at 21 cm for the hydrogen atom in the interstellar medium

Solovyev

2018

J. Phys. B: At. Mol. Opt. Phys.

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The paper analyzes the absorption line profile at 21 cm for the hydrogen atom in the interstellar medium. The hydrogen atom is treated as a three-level system illuminated by a powerful light source at neighboring resonances corresponding to the hyperfine splitting of the ground state and Ly α transition. The field acting upon the resonances gives rise to physical processes, which can be explained as interfering pathways between different transitions. The paper considers particular cases when the 21 cm line profile is substantially modified by the Ly α transition. A correction to the optical depth is introduced as a result of theory. It is shown that the correction can be considerable and should be taken into account when determining the column density of hydrogen atoms in the interstellar medium. The paper also deals with the effects of none-Doppler broadening and frequency shift.

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Section: Analysis Of Resultsmentioning

confidence: 99%

Section: Correction To the Optical Depth Via The Evaluation Of Three-...mentioning

confidence: 99%

Analysis of the absorption line profile at 21 cm for the hydrogen atom in the interstellar medium

Solovyev

2018

J. Phys. B: At. Mol. Opt. Phys.

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“…In [48] it was shown that taking into account the asymmetry of the Ly α profile can lead to an underestimation of the redshift of some astrophysical sources by ∆z ∼ 10 −3 − 10 −4 , which is on the level of current experimental observations [51]. The effect of electromagnetically induced transparency, which leads to a distortion of the absorption profile, was discussed in this context in [52,53,54].…”

Section: Introductionmentioning

confidence: 96%