3 papers
astro-ph.CO2009★ 28 cited
Directional Radiation and Photodissociation Regions in Molecular Hydrogen Clouds
S. A. Balashev, D. A. Varshalovich, A. V. Ivanchik
Some astrophysical observations of molecular hydrogen point to a broadening of the velocity distribution for molecules at excited rotational levels. This effect is observed in both…
astro-ph2008★ 62 cited
HD molecules at high redshift: A low astration factor of deuterium in a solar-metallicity DLA system at z=2.418
P. Noterdaeme, P. Petitjean, C. Ledoux +2
We present the detection of deuterated molecular hydrogen (HD) in the remote Universe in a damped Lyman-alpha cloud at zabs=2.418 toward the quasar SDSS J143912.04+111740.5. This i…
astro-ph2006★ 60 cited
Two-Photon 2s<->1s Transitions during Recombination of Hydrogen in the Universe
E. E. Kholupenko, A. V. Ivanchik
Based on the standard cosmological model, we calculate the correction to the rate of two-photon 2s<->1s transitions in the hydrogen atom under primordial hydrogen plasma recombinat…