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Development of a Glow-Discharge Ion-Trap Instrument for Measuring Effective Radiative-Association Rate Coefficients.

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A new instrument measures radiative-association rate coefficients for ion-molecule reactions crucial in space. The study provides the first pressure-dependent data for Ag+ and O2, yielding a rate coefficient lower limit.

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Area of Science:

  • Chemical Physics
  • Astrochemistry
  • Physical Chemistry

Background:

  • Radiative association is vital in cold space environments.
  • Measuring radiative-association rate coefficients for ion-molecule reactions is experimentally challenging.
  • Astrophysical models require accurate rate coefficients for ion-molecule reactions.

Purpose of the Study:

  • To develop and evaluate a novel instrument for measuring slow ion-molecule radiative-association reactions.
  • To investigate the reaction kinetics of species relevant to astrophysical objects.
  • To determine effective radiative-association rate coefficients for specific ion-molecule systems.

Main Methods:

  • A custom reaction kinetics instrument was designed and built.
  • The instrument utilizes a glow-discharge ion source, quadrupole mass filter, and quadrupole ion trap.
  • The reaction of Ag+ and O2 was studied under pseudo-first-order conditions at room temperature.

Main Results:

  • The instrument successfully measured slow kinetics, demonstrating its capability.
  • The first pressure-dependent study of the Ag+ + O2 reaction was conducted.
  • A lower limit of 1 × 10^-15 cm^3 s^-1 was determined for the Ag+ + O2 effective radiative-association rate coefficient.

Conclusions:

  • The developed instrument is versatile and capable of measuring radiative-association rate coefficients for diverse ion-molecule reactions.
  • The findings contribute to a better understanding of chemical processes in interstellar environments.
  • This work paves the way for more accurate astrophysical modeling.