Calculated Xradiation from optically thin plasmas. VI  Improved calculations for continuum emission and approximation formulae for nonrelativistic average Gaunt actors.
Abstract
The continuum spectrum of an optically thin plasma whose electrons have a Maxwellian energy distribution is calculated for the wavelength range 1  1000 Å and temperature range 0.01  100 MK. The effect of recombination to excited states on the freebound emission is taken into account. Simple analytic approximations to the total freefree, freebound and twophoton Gaunt factors are presented for various wavelength and temperature intervals covering the whole considered range. A simple computer routine for calculating the continuum emission with the aid of this approximation is given.
 Publication:

Astronomy and Astrophysics Supplement Series
 Pub Date:
 September 1986
 Bibcode:
 1986A&AS...65..511M
 Keywords:

 Plasma Radiation;
 Plasma Spectra;
 X Ray Spectroscopy;
 Continuous Spectra;
 Electron Energy;
 Ionization;
 X Ray Sources;
 Plasma Physics