## Research Fig.1:

**Radiative recombination cross section** as a function of electron energy for some (effective) atomic levels and total (normalized corresponding to oxygen at 1200

^{o}K).

(the exact wave functions for hydrogen-like atomic systems have been used for the numerical calculations; the absolute value of the curves was normalized so that the cross section for n

^{*}=1 was identical with the (measured) value for the photo-ionization cross section; see the

Home Page for a detailed discussion of the theory).