Ercolano, B; Storey, PJ; (2006) Theoretical calculations of the HI, HeI and HeII free-bound continuous emission spectra. MON NOT R ASTRON SOC , 372 (4) 1875 - 1878. 10.1111/j.1365-2966.2006.10988.x.

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Abstract

We present coefficients for the calculation of the continuous emission spectra of H I, He I and He II due to electron-ion recombination. Coefficients are given for photon energies from the first ionization threshold for each ion to the n = 20 threshold of hydrogen (36.5 mu m), and for temperatures 100 <= T <= 10(5) K. The emission coefficients for He I are derived from accurate ab initio photoionization data. The coefficients are scaled in such a way that they may be interpolated by a simple scheme with uncertainties less than 1 per cent in the whole temperature and wavelength domain. The data are suitable for incorporation into photoionization/plasma codes and should aid with the interpretation of spectra from the very cold ionized gas phase inferred to exist in a number of gaseous clouds.

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