Recombination of helium-like ions - I. Photoionization cross-sections and total recombination and cooling coefficients for atomic helium

Details Recombination of helium-like ions - I. Photoionization cross-sections and total recombination and cooling coefficients for atomic helium Recombination of helium-like ions - I. Photoionization cross-sections and total recombination and cooling coefficients for atomic helium

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.297.1073h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 297, Issue 4, pp. 1073-1078.

Astronomy and Astrophysics

Astronomy

45

Atomic Data, Atomic Processes, Line: Formation

Scientific paper

A new calculation of photoionization cross-sections is described for the ground and excited states of atomic helium up to principal quantum number n=25 and angular momentum quantum number l=5. These cross-sections are used to calculate total recombination and cooling coefficients for atomic helium for electron temperatures given by log(T)=1(0.2)4.4. A comparison of the threshold photoionization cross-sections obtained here with extrapolations of the highly accurate bound-bound oscillator strength calculations by Drake shows that the new calculations are in error by no more than 1 per cent. The accuracy of the photoionization cross-sections used by previous workers to derive recombination coefficients is also discussed.

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