Radiative recombination of the ground state of lithium-like ions

Details Radiative recombination of the ground state of lithium-like ions Radiative recombination of the ground state of lithium-like ions

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..339p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 1, 1983, p. 339-341. Research supported by the Natural Sciences a

Astronomy and Astrophysics

Astrophysics

4

Atomic Energy Levels, Ground State, Ion Recombination, Lithium, Photoionization, Radiative Recombination, Atomic Spectra, Electron Energy, Ionization Cross Sections, Ionization Potentials, Recombination Coefficient

Scientific paper

The equation for the radiative recombination coefficient alpha(RR) of Li-like ions in the ground state is simplified by separating the energy regions contributing to radiative and dielectric recombinations. Alpha(RR) (in cu cm/sec) at temperature T (in deg K), ionization potential E(O) (in rydbergs), and threshold photoionization cross section sigma(O) (in megabarns, 10 to the -18th sq cm) is shown to be given by alpha(RR)(T) = 2.61 x 10 to the 6th sigma(O) E(O) sq/sq rt T. The results obtained with this expression are compared with those of previous methods. It is found that sigma(O) values varying only slowly with nuclear charge (Z) for Z greater than 8, as computed by Reilman and Manson (1978), are more consistent with the expression than the extrapolated values of Aldrovandi and Pequinot (1973). Alpha(RR)(10,000 K) for Z = 10, 12, 14, and 16 is determined to be 2.42 x 10 to the -13th, 5.14 x 10 to the 12th, 1.02 x 10 to the -11th, and 1.80 x 10 to the -11th cu cm/sec, respectively.

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