Long-lived, doubly charged diatomic and triatomic molecular ions

Mathur, D. ; Andersen, L. H. ; Hvelplund, P. ; Kella, D. ; Safvan, C. P. (1995) Long-lived, doubly charged diatomic and triatomic molecular ions Journal of Physics B: Atomic, Molecular and Optical Physics, 28 (15). pp. 3415-3426. ISSN 0953-4075

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Official URL: http://iopscience.iop.org/0953-4075/28/15/027

Related URL: http://dx.doi.org/10.1088/0953-4075/28/15/027


Lifetimes of doubly charged diatomic and triatomic molecules have been measured by monitoring the decay curves of such ions in a heavy-ion storage ring. CO2+, N22+, CO22+, CS22+ and SH2+ are all found to possess long-lived components which survive for time periods greater than a few seconds. All these dications are found to be essentially stable and their ultimate destruction is due to interactions with residual gases in the ring. CO2+ possesses many more lifetime components in the millisecond range than the isoelectronic N22+ ion. Translational energy spectrometry experiments on the latter species also fail to reveal any short-lived (microsecond) components. Ab initio configuration interaction calculations have been carried out and the potential energy curve for the lowest-energy metastable state of N22+ (1 Sigma g) has been determined, along with Franck-Condon factors for vertical transitions to different vibrational levels from the ground state of neutral N2; tunnelling times of each vibrational level have been computed.

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