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Related Experiment Videos

Probing the structure of cometary ice.

M A Wilson1, A Pohorille, P Jenniskens

  • 1NASA Ames Research Center, Moffett Field, CA 94035, USA.

Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life
|June 1, 1995
PubMed
Summary
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Computer simulations reveal amorphous ice structures. Vapor deposition creates more porous ices than bulk amorphous ice, impacting astrophysical ice research and the origin of life.

Area of Science:

  • Materials Science
  • Computational Physics
  • Astrochemistry

Background:

  • Amorphous ices are crucial in astrophysical environments.
  • Understanding their structure is key to studying prebiotic chemistry.
  • Previous studies lacked detailed structural insights into vapor-deposited amorphous ices.

Purpose of the Study:

  • To simulate and characterize the structure of bulk and vapor-deposited amorphous ices.
  • To compare simulation results with experimental data.
  • To investigate the influence of deposition conditions on ice porosity.

Main Methods:

  • Utilized computer simulations for bulk and vapor-deposited amorphous ices.
  • Analyzed structural ordering and porosity.
  • Compared simulation outcomes with experimental electron diffraction data.
Keywords:
NASA Center ARCNASA Discipline ExobiologyNASA Discipline Number 52-10NASA Discipline Number 52-20NASA Program Exobiology

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Main Results:

  • Simulated low-density amorphous ice structure agrees well with experimental data.
  • Vapor-deposited ices are more porous than bulk amorphous ice.
  • Hot molecule deposition yields less porous ice than cold molecule deposition.
  • High-density amorphous ice simulations showed only fair agreement with experiments.

Conclusions:

  • Vapor deposition methods create more porous amorphous ices compared to bulk ice.
  • The microporosity of vapor-deposited ices may influence astrophysical ice simulations.
  • Further research is needed to understand ice reconstruction and its implications for prebiotic chemistry.