The opportunity of populating of Hg and N2 levels due to ion-ion recombination is considered. Spectra of a luminescence of mixtures 3He + N2 + NF3 (CCl4) are investigated on nuclear reactor installation. It was supposed, that populating of N2 (C3U) in processes: N2 + + F- (Cl-) + M N2 (C 3u) + F (Cl) + M, will lead to increase of the intensity of the second positive system of nitrogen. However measurements have shown that molecular bands of nitrogen don't amplify at addition of electro-negative gases. Spectra of luminescence of mixtures He + Hg + O2 (CO2) are investigated on installation with excitation by α-particles of 210Po. It was supposed, that in processes of recombination: Hg + + O- + M Hg* + O + M Hg+ +O 2- + M Hg ** +O2 + M will be populated 73S1 and probably 6D levels of Hg. The observed increase in intensity of triplet lines of mercury at addition of CO2 to a mixture 3He + Hg, apparently, is connected with recombination of ions Hg+ and O-.