Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.300..321s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 300, Issue 2, pp. 321-330.
Astronomy and Astrophysics
Astronomy
28
Atomic Data, Atomic Processes, Plasmas, Radiation Mechanisms: Thermal, Ism: General
Scientific paper
New calculations of free-free transition matrix element integrals are performed using modern symbolic computing techniques to evaluate the hypergeometric functions with complex arguments. The results are presented in both graphical and tabular form including accurate extrapolation methods. The results are accurate to the level of ~10^-4, beyond which relativistic corrections would be needed, which are not included. The results are also computed over a very wide range of scaled ionic temperature (gamma^2) and wavelength, extending earlier results to new regimes encountered in highly photoionized and non-equilibrium ionization plasmas. These results will be useful in the spectral range from submillimetre to hard X-ray wavelengths and temperatures from 10 to 10^9 K.
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