Ion sources for superheavy elements: Towards ionisation potential (IP) measurements with the VADIS source

The feasibility of Rutherfordium IP measurements with the electron-impact source VADIS has been studied theoretically by estimation of adsorption properties and first experiments of ion source efficiency in function of mean electron energy. • IPs of noble gases could be derived within an error of 0.1 V following an extrapolation method. • Adsorption properties suggest, that temperatures above nominal conditions are necessary. • Further R&D is needed, which might include the partial redesign of the source.
Poster presented at the 6th International Conference on the Chemistry and Physics of the Transactinide Elements (TAN 19)