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Excitation-assisted nonadiabatic charge-transfer reaction in a mixed atom-ion system
Li, M Mills, M Puri, P Petrov, A Hudson, ER Kotochigova, S
Li, M
Mills, M
Puri, P
Petrov, A
Hudson, ER
Kotochigova, S
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Pre-print
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2019-06-14
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10.1103/PhysRevA.99.062706
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© 2019 American Physical Society. An important physical process unique to neutral-ion systems is the charge-transfer reaction. Here, we present measurements of and models for charge-transfer processes between cotrapped ultracold Ca atoms and Yb ions under well-controlled conditions. The theoretical analysis suggests the existence of three reaction mechanisms when lasers from a magneto-optical trap and an additional catalyst laser are present. We show that the near-degeneracy of the excited Ca(P11)+Yb+(S2) and Ca+(S2)+Yb(D23) asymptotic limits leads to large charge-transfer rate coefficients that can be controlled by changing the frequency of the catalyst laser and the ion temperature. Our model agrees with experimental rate-coefficient measurements between 50 mK and 1 K, with and without the catalyst laser, using just a single free parameter.
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Physical Review A
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