Scattering of x-ray emission lines by molecular hydrogen

Details Scattering of x-ray emission lines by molecular hydrogen Scattering of x-ray emission lines by molecular hydrogen

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astl...25..199s&link_type=abstract

Astronomy Letters, Volume 25, Issue 4, April 1999, pp.199-205

Astronomy and Astrophysics

Astronomy

7

Scientific paper

As was shown by Sunyaev and Churazov (1996) and Vainshtein et al. (1998), distortions in the profiles of X-ray emission lines during the scattering by hydrogen and helium atoms can in principle be used to determine the helium abundance in astrophysical objects. The differences between the scatterings of X-ray photons by atomic and molecular hydrogen are briefly discussed. The most obvious and significant difference is an increase in the elastic scattering cross section (by a factor of 2 per electron) for molecular hydrogen. For many astrophysical applications, standard analytical expressions for the scattering cross section for a hydrogen atom (with the elastic scattering cross section increased by a factor of 2) can be used to describe the scattering of X-ray photons by a hydrogen molecule.

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