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Correction to "High-Resolution Photoelectron Spectroscopy of the X<sup>+</sup> <sup>2</sup>Σ<sup>+</sup> Ground State of CaAr<sup>+</sup>".

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Microwave-Controlled Cold Chemistry.

Fernanda B V Martins1, Hansjürg Schmutz1, Josef A Agner1

  • 1ETH Zürich, Institute of Molecular Physical Science, Zürich, Switzerland.

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|April 11, 2025
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Microwaves can control cold ion-molecule reactions by altering molecular rotation. This study demonstrates up to 40% reaction inhibition using resonant microwave pulses, revealing a nonthermal control mechanism.

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Area of Science:

  • Chemical kinetics
  • Physical chemistry
  • Quantum control

Background:

  • Ion-molecule reactions are fundamental in chemistry and astrophysics.
  • Controlling these reactions at low temperatures is crucial for understanding reaction dynamics.
  • Rotational states of molecules significantly influence reaction pathways and rates.

Purpose of the Study:

  • To introduce a novel method for controlling cold ion-molecule chemistry using microwaves.
  • To investigate the influence of molecular rotational-state populations on reaction rates.
  • To demonstrate a nonthermal mechanism for microwave-assisted chemical control.

Main Methods:

  • Utilized a merged-beam approach to study the reaction between He+ and rotationally cold CO molecules.
  • Achieved collision energies ranging from approximately 0 to 10 K.
  • Manipulated the rotational-state population of CO molecules using resonant microwave pulses.

Main Results:

  • Achieved up to 40% inhibition of the ion-molecule reaction rate.
  • Demonstrated that microwave pulses resonant with pure-rotational transitions in CO significantly affect reaction outcomes.
  • Provided unambiguous evidence for a nonthermal mechanism driving microwave-assisted chemistry.

Conclusions:

  • Microwave control of rotational-state populations offers a powerful tool for steering ion-molecule reactions.
  • This technique enables precise manipulation of chemical reactivity at low temperatures.
  • The findings open new avenues for controlling chemical processes using quantum effects.