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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

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Published on: December 3, 2013

Reactant-product quantum coherence in electron transfer reactions.

I K Kominis1

  • 1Department of Physics, University of Crete, Heraklion 71103, Greece.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 26, 2012
PubMed
Summary
This summary is machine-generated.

Quantum superposition states between reactants and products are suppressed in electron transfer reactions due to intermediate states. This finding impacts understanding quantum dynamics in radical-ion-pair reactions.

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Area of Science:

  • Quantum Chemistry
  • Chemical Physics
  • Theoretical Chemistry

Background:

  • Electron transfer reactions are fundamental in chemistry and biology.
  • Quantum superposition is a key concept in quantum mechanics.
  • Understanding quantum dynamics is crucial for reaction mechanisms.

Purpose of the Study:

  • To investigate the physical meaning and prevalence of quantum superposition states in electron transfer reactions.
  • To determine the conditions under which these superposition states exist or are suppressed.
  • To relate quantum coherences to the dynamics of spin-selective radical-ion-pair reactions.

Main Methods:

  • Theoretical investigation of quantum superposition states.
  • Perturbation theory analysis.
  • Feynman diagrams for intuitive description.

Main Results:

  • Quantum superposition states between reactants and products are strongly suppressed in electron transfer reactions.
  • These superpositions do not pertain to leading orders of perturbation theory.
  • An intermediate manifold of states separates reactants from products, causing suppression.

Conclusions:

  • Quantum superposition is generally not a valid description for the transition between reactants and products in electron transfer reactions.
  • The suppression is explained by the presence of intermediate states.
  • This work provides insights into the quantum dynamics of radical-ion-pair reactions.