Isotope effects in the metastable decay of Ne2+
Institut für Ionenphysik und Angewandte Physik, Leopold Franzens Universität, Technikerstr. 25, 6020 Innsbruck, Austria
Revised: 19 September 2006
Published online: 24 May 2007
Neon dimer ions undergo spontaneous dissociation (metastable decay) several microseconds after formation by electron impact ionization of neon clusters. In this contribution we compare the kinetic energy release distribution (KERD) of the previously reported isotopomer 20Ne2+ with that of 22Ne2+. The heavy isotopomer shows the same two components in the KERD as the lighter ones. However, the high-energy component that is due to electronic pre-dissociation is reduced in intensity. The decrease is attributed to a reduced predissociation rate from the II(1/2u) state into I(3/2u).
PACS: 36.40.Qv – Stability and fragmentation of clusters / 36.40.Wa – Charged clusters / 33.15.Hp – Barrier heights (internal rotation, inversion, rotational isomerism, conformational dynamics) / 34.30.+h – Intramolecular energy transfer; intramolecular dynamics; dynamics of van der Waals molecules
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007