Journal
MOLECULAR PHYSICS
Volume 111, Issue 12-13, Pages 1683-1690Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00268976.2013.770930
Keywords
cold ion-neutral reactions; hybrid traps; cold chemistry; radiative association; charge transfer
Funding
- Swiss National Science Foundation [PP0022_118921, PP00P2_140834]
- COST Action [MP1001]
- Swiss National Science Foundation (SNF) [PP0022_118921, PP00P2_140834] Funding Source: Swiss National Science Foundation (SNF)
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Light-assisted reactive collisions between laser-cooled Ba+ ions and Rb atoms were studied in an ion-atom hybrid trap. The reaction rate was found to strongly depend on the electronic state of the reaction partners with the largest rate constant [7(2) x 10(-11) cm(3) s(-1)] obtained for the excited Ba+(6s)+Rb(5p) reaction channel. Similar to the previously studied Ca++Rb system, charge transfer and radiative association were found to be the dominant reactive processes. The generation of molecular ions by radiative association could directly be observed by their sympathetic cooling into a Coulomb crystal. Potential energy curves up to the Ba+(6s)+Rb(5p) asymptote and reactive-scattering cross sections for the radiative processes were calculated. The theoretical rate constant obtained for the lowest reaction channel Ba+(6s)+Rb(5s) is compatible with the experimental estimates obtained thus far.
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