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[Not Available].

Eduardo Carrascosa1, Martin A Kainz1, Martin Stei1

  • 1Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck , Technikerstraße 25, 6020 Innsbruck, Austria.

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Summary
This summary is machine-generated.

The reaction between hydrogen cation (H3+) and carbon monoxide (CO) in space primarily forms HCO+, not HOC+. This interstellar chemistry finding challenges previous predictions about isomer formation under thermal conditions.

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Area of Science:

  • Astrochemistry
  • Chemical Dynamics
  • Interstellar Medium

Background:

  • The reaction between H3+ and CO is crucial for interstellar chemistry.
  • Understanding isomer formation (HCO+ vs. HOC+) is key to modeling interstellar environments.

Purpose of the Study:

  • Investigate the dynamics of the H3+ + CO reaction.
  • Determine the product isomer ratio (HCO+ vs. HOC+) at various collision energies.

Main Methods:

  • Utilized crossed beam velocity map imaging technique.
  • Analyzed product scattering direction and internal energy distributions.
  • Fitted distribution functions to extract isomer ratios.

Main Results:

  • Formyl product cations (HCO+) scattered predominantly forward.
  • High internal energy transfer to products observed.
  • A small HOC+ fraction (≤24% at 1.8 eV) was detected, with purely HCO+ formation at lower energies.

Conclusions:

  • Direct reaction dynamics limit HOC+ formation, contrary to thermal predictions.
  • The observed isomer ratio provides critical data for astrochemical models.
  • This study refines our understanding of ion-molecule reactions in space.