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Quantum Control of Atom-Ion Charge Exchange via Light-Induced Conical Intersections.

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Ultracold atom-ion reactions show significant nonadiabatic effects due to laser-induced conical intersections (LICIs). These LICIs cause irregular interference in charge-exchange rates, impacting molecular dynamics.

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Area of Science:

  • Quantum chemistry
  • Molecular dynamics
  • Atomic physics

Background:

  • Conical intersections (CIs) are critical in molecular dynamics, influencing chemical reactions.
  • Nonadiabatic coupling, often associated with CIs, significantly impacts molecular properties.
  • Laser-induced conical intersections (LICIs) offer a novel way to control these effects.

Purpose of the Study:

  • To investigate nonadiabatic effects in ultracold K-Ca+ charge-exchange reactions.
  • To explore the impact of LICIs on molecular reactivity under specific ultracold conditions.
  • To analyze interference effects in reaction rates influenced by LICIs.

Main Methods:

  • Theoretical prediction of nonadiabatic effects.
  • Simulation of ultracold atom-ion charge-exchange reactions.
  • Analysis of reaction rate coefficients as a function of laser frequency.
  • Comparison of systems with and without LICIs.

Main Results:

  • Significant nonadiabatic effects were predicted in K-Ca+ reactions with LICIs.
  • Irregular interference patterns were observed in charge-exchange rate coefficients.
  • The presence of two LICIs was identified as the cause of these irregularities.
  • Differences in rate coefficients reached up to 1 × 10^-9 cm^3/s when LICIs were present.

Conclusions:

  • LICIs can significantly alter molecular reactivity in ultracold environments.
  • Interference effects induced by LICIs provide a mechanism to control reaction dynamics.
  • The findings highlight the importance of nonadiabatic effects in atom-ion reactions under laser control.