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The geometric phase controls ultracold chemistry.

B K Kendrick1, Jisha Hazra2, N Balakrishnan2

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Geometric phase controls ultracold chemical reactions by altering interference between scattering pathways. This quantum effect, demonstrated in O+OH reactions, can significantly modify reaction rates and offers experimental control over reactivity using fields.

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Area of Science:

  • Chemical Physics
  • Quantum Chemistry
  • Physical Chemistry

Background:

  • Geometric phase influences quantum systems.
  • Ultracold chemical reactions exhibit unique quantum phenomena.
  • Conical intersections are critical in molecular reactions.

Purpose of the Study:

  • To demonstrate geometric phase control over ultracold chemical reactions.
  • To investigate the role of conical intersections in ultracold reaction dynamics.
  • To explore experimental methods for manipulating ultracold reaction rates.

Main Methods:

  • Theoretical analysis of scattering pathways in ultracold regime.
  • Investigating interference effects between direct and looping scattering pathways.
  • Utilizing the O+OH→H+O2 reaction as a model system.

Main Results:

  • Geometric phase directly controls reaction outcomes via interference.
  • Ultracold conditions quantize scattering phase shifts.
  • Reaction rates modified by up to two orders of magnitude.
  • Conical intersections facilitate geometric phase effects.

Conclusions:

  • Geometric phase is a key factor in ultracold reaction control.
  • Quantum interference effects are significant at ultracold temperatures.
  • External fields can be used to tune geometric phase and reaction rates.