Momentum transfer in photoionization of one-electron ions.

Details Momentum transfer in photoionization of one-electron ions. Momentum transfer in photoionization of one-electron ions.

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...309..979m&link_type=abstract

Astronomy and Astrophysics, v.309, p.979-990

Astronomy and Astrophysics

Astrophysics

17

Atomic Processes, Diffusion, Stars: Abundances, Stars: Chemically Peculiar

Scientific paper

Including atomic diffusion in stellar evolution and structure studies implies computing accurately selective radiative forces, a part of which comes from photoionization. The transfer of momentum from a photon ionizing an atom to the ejected photoelectron and resulting ion is considered. The angular algebra is solved for a general one-electron atom leading to a formula implying only dipolar and quadrupolar bound-free radial integrals. Analytical results are presented for hydrogen-like ions, as well as an efficient numerical implementation and fits. It is seen that the residual ion can recoil, an effect opposite to the bound-bound absorption. Our numerical method also leads to efficient calculations of hydrogenic cross-sections.

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