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Related Experiment Videos

Carbamic acid: molecular structure and IR spectra.

R K Khanna1, M H Moore

  • 1Department of Chemistry and Biochemistry, University of Maryland, College Park 20742, USA.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|May 29, 1999
PubMed
Summary

Proton irradiation of mixed ices (water, ammonia, carbon dioxide) formed carbamic acid. This molecule is stabilized by hydrogen bonding in its solid zwitter-ionic form.

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Area of Science:

  • Astrochemistry
  • Solid-state chemistry
  • Spectroscopy

Background:

  • Interstellar ices are crucial for understanding chemical evolution in space.
  • Proton irradiation is a significant energetic process in astrophysical environments.

Purpose of the Study:

  • To investigate the chemical reactions occurring in mixed ices under proton irradiation.
  • To identify new molecules formed in astrophysical ice analogs.

Main Methods:

  • Formation of mixed ices containing H2O, NH3, and CO2 (12CO2/13CO2).
  • Irradiation of ices with 1 MeV protons.
  • Analysis of infrared absorption spectra to identify reaction products.

Main Results:

  • Detection of carbamic acid (NH2COOH) in the irradiated ices.
  • Evidence suggests carbamic acid forms at low temperatures.
  • Spectroscopic data indicates stabilization via intermolecular hydrogen bonding.

Conclusions:

  • Carbamic acid can form in astrophysical ice analogs under energetic processing.
  • The zwitter-ionic (NH3+ COO-) structure contributes to solid-phase stability.
  • This finding has implications for the inventory of organic molecules in space.

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