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Formaldehyde reactions in dark clouds.

A D Sen1, V G Anicich, S R Federman

  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena 91109, USA.

The Astrophysical Journal
|May 20, 1992
PubMed
Summary
This summary is machine-generated.

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Reactions between formaldehyde and deuterated ions like D+ were studied. Charge transfer dominated, with proton transfer only seen with D3+ ions, near the collision limit.

Area of Science:

  • Astrochemistry
  • Chemical Kinetics
  • Interstellar Medium

Background:

  • Formaldehyde (H2CO) is a key molecule in dark interstellar clouds.
  • Understanding formaldehyde loss processes is crucial for astrochemistry.
  • Deuterated ions serve as experimental analogs for proton reactions.

Purpose of the Study:

  • Investigate low-pressure reactions of formaldehyde with D+, D2+, D3+, and He+.
  • Determine rate coefficients and product branching ratios for these reactions.
  • Assess the significance of these reactions as formaldehyde loss pathways in interstellar clouds.

Main Methods:

  • Utilized the ion cyclotron resonance technique.
  • Studied reactions at low pressures.
  • Measured rate coefficients and branching ratios of product channels.
Keywords:
NASA Center JPLNASA Discipline ExobiologyNASA Discipline Number 52-10NASA Program Exobiology

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Main Results:

  • Charge transfer was the dominant reaction pathway for H2CO with D+, D2+, and He+.
  • Proton transfer was exclusively observed in the reaction of H2CO with D3+.
  • All studied reactions occurred at rate coefficients near the collision limit.
  • Proton-deuteron exchange reactions were found to be inefficient.

Conclusions:

  • These ion-molecule reactions are significant potential loss processes for formaldehyde in interstellar cloud cores.
  • The experimental findings provide insights into the chemical evolution of interstellar environments.
  • Charge transfer and proton transfer reactions play distinct roles depending on the reactant ion.