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Water Attachment onto Size-Selected Cationic Pyrene Clusters.

Sébastien Zamith1, Ali Kassem1,2, Jean-Marc L'Hermite1

  • 1Laboratoire Collision Agrégats Réactivité (LCAR/IRSAMC), UMR5589, Université de Toulouse III - Paul Sabatier and CNRS, 118 Route de Narbonne, F-31062 Toulouse, France.

The Journal of Physical Chemistry. A
|June 7, 2022
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Summary
This summary is machine-generated.

Water molecule attachment to pyrene clusters was measured. Attachment rates depend on cluster size and collision energy, providing insights into astrophysical conditions.

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Area of Science:

  • Physical Chemistry
  • Astrochemistry
  • Chemical Physics

Background:

  • Understanding molecular interactions with nanoparticles is crucial for various fields, including astrochemistry.
  • Pyrene clusters are relevant in astrophysical environments, and their interaction with water is not fully understood.

Purpose of the Study:

  • To measure the attachment rates of water molecules onto cationic pyrene clusters.
  • To determine the sticking coefficient of water on pyrene clusters.
  • To model the attachment process and extrapolate findings to astrophysical conditions.

Main Methods:

  • Mass-selected cationic pyrene clusters (n=4-13) were used.
  • Attachment rates were measured at various collision energies.
  • Collision-induced dissociation experiments were performed to determine collision rates.
  • A model incorporating Langevin-type collision rates and statistical dissociation rates was developed.

Main Results:

  • Attachment rates showed a strong dependence on pyrene cluster size and collision energy.
  • Sticking coefficients were determined by comparing attachment and collision rates.
  • The developed model successfully rationalized the experimental data.

Conclusions:

  • The study provides quantitative data on water molecule attachment to pyrene clusters.
  • The findings offer insights into the formation and evolution of icy species in astrophysical environments.
  • The model allows extrapolation to conditions relevant for interstellar ice formation.