Abstract
State-selected Coulomb-crystallized molecular ions were employed for the first time in ion–molecule reaction studies using the prototypical charge-transfer process N2++N2→N2+N2+ as an example. By preparing the reactant ions in a well-defined rovibrational state and localizing them in space by sympathetic cooling to milliKelvin temperatures in an ion trap, state- and energy-controlled reaction experiments with sensitivities on the level of single ions were performed. The experimental results were interpreted with quasi-classical trajectory simulations on a six-dimensional potential-energy surface which provided detailed insight into translation-to-rotation energy transfer occurring during charge transfer between N2 and N2+.
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