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Evaluating Infrared Absorption Parameters for Low-Temperature Ices Using Reflection-Absorption Infrared Spectroscopy.

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This study calculates infrared absorption parameters for molecular ices using reflection-absorption infrared spectroscopy (RAIRS). Findings help compare RAIRS data to transmission methods for astrochemistry.

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Area of Science:

  • Spectroscopy
  • Astrochemistry
  • Materials Science

Background:

  • Molecular ices are crucial in interstellar chemistry.
  • Accurate spectroscopic data is needed for astrophysical models.
  • Reflection-absorption infrared spectroscopy (RAIRS) offers a surface-sensitive method.

Purpose of the Study:

  • To calculate infrared absorption coefficients, cross sections, and band strengths for methyl acetate and methyl propanoate ices.
  • To develop a conversion factor for comparing RAIRS data to transmission infrared spectroscopy.
  • To assess the limitations and assumptions of using RAIRS for quantitative analysis of molecular ices.

Main Methods:

  • Deposition of molecular ices (methyl acetate, methyl propanoate) on highly oriented pyrolytic graphite (HOPG) at 28 K.
  • Acquisition of reflection-absorption infrared spectroscopy (RAIRS) data.
  • Calculation of infrared absorption parameters and development of a conversion factor considering surface selection rules and enhancement effects.

Main Results:

  • Infrared absorption coefficients, cross sections, and band strengths were determined from RAIRS data.
  • An estimated conversion factor was derived to reconcile RAIRS parameters with transmission infrared methods.
  • The study highlights limitations and necessary assumptions for interpreting RAIRS data.

Conclusions:

  • RAIRS can provide valuable quantitative infrared absorption data for molecular ices.
  • The developed conversion factor aids in integrating RAIRS findings with existing spectroscopic databases.
  • Understanding RAIRS limitations is crucial for accurate astrochemistry modeling.