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Experimental gas jet studies for the IGISOL LIST method and simulation modeling

2010

The IGISOL Laser Ion Source Trap (LIST) is a method in which a supersonic gas jet is used to transport thermalized nuclear reaction products from a gas cell into a sextupole radio frequency ion guide (SPIG) while removing any non-neutral part of the jet by a positively biased repeller electrode. Specific atom species are resonantly re-ionized with laser radiation in the SPIG which enables the study of exotic nuclei without isobaric contamination. In the first part of this work the repelling effect is studied through a series of ion optical Monte-Carlo simulations. The simulations were able to support the hypothesis that the constant collisions between the fast moving buffer gas atoms and th…