Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 42: Ultra-cold atoms, ions and BEC IV
A 42.4: Vortrag
Freitag, 16. März 2012, 11:30–11:45, V57.03
Light-assisted ion-neutral reactive processes in the cold regime: radiative molecule formation vs. charge exchange — Felix H. J. Hall1, Mireille Aymar2, Nadia Bouloufa2, •Olivier Dulieu2, and Stefan Willistch1 — 1Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland — 2Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, Orsay, France
We present a combined experimental and theoretical study of cold reactive collisions between lasercooled Ca+ ions and Rb atoms in an ion-atom hybrid trap. We observe rich chemical dynamics which are interpreted in terms of non-adiabatic and radiative charge exchange as well as radiative molecule formation using high-level electronic structure calculations. We study the role of light-assisted processes and show that the efficiency of the dominant chemical pathways is considerably enhanced in excited reaction channels. Our results illustrate the importance of radiative and non-radiative processes for the cold chemistry occurring in ion-atom hybrid traps.