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We describe a system to transport and identify barium ions produced in liquidxenon, as part of R&D towards the second phase of a double beta decayexperiment, nEXO. The goal is to identify the Ba ion resulting from anextremely rare nuclear decay of the isotope $^{136}$Xe, hence providing aconfirmation of the occurrence of the decay. This is achieved through ResonanceIonization Spectroscopy (RIS). In the test setup described here, Ba ions can beproduced in liquid xenon or vacuum and collected on a clean substrate. Thissubstrate is then removed to an analysis chamber under vacuum, wherelaser-induced thermal desorption and RIS are used with time-of-flight (TOF)mass spectroscopy for positive identification of the barium decay product.

An apparatus to manipulate and identify individual Ba ions from bulk liquid Xe