Performance of a dodecapole collision chamber for the study of ion–molecule reactions using synchrotron radiation

Abstract

For the study of state selected ion–molecule reactions using synchrotron radiation, an apparatus incorporating a dodecapole collision chamber has been constructed. Its performance has been examined utilizing the Ne+ ions produced by photoionization of Ne at the 2P3/2 threshold. It has been confirmed that both the transmission of the primary ions and the collection efficiency for the secondary ions remain unchanged when the ion kinetic energy is varied over a wide range of interest. The ion–molecule reaction Ne++OCS has been studied using this apparatus, selecting the spin-orbit states of the reactant ion by the time-of-flight coincidence technique.