229Th and 232Th optical spectroscopy system for nuclear frequency standard

The results of developing of the laboratory complex for optical spectroscopy of multiply charged thorium ions are presented. The preliminary experimental results on producing single, double and triple charged ions from solid compounds of thorium nitrate by electron beam evaporation technique are reported. It is shown that the proportion of triple and double charged thorium ions obtained by this method to single ones exceeds the values for the laser ablation technique. The electron beam evaporation technique is the basis of the developed complex.