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Interstellar ice surface site modification induced by dicyanoacetylene adsorption.

Zohra Guennoun1, Isabelle Couturier-Tamburelli, Nathalie Piétri

  • 1UMR CNRS 6633, Physique des Interactions Ioniques et Moléculaires, Equipe de Spectrométries et Dynamique Moléculaires, Université de Provence, Case 252, Centre de St-Jérôme, 13397 Marseille Cedex 20, France.

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary

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Dicyanoacetylene interacts with amorphous ice, forming a unique adsorption site. Warming causes desorption, indicating ice crystallization and a hydrogen-bonded state for dicyanoacetylene on ice.

Area of Science:

  • Surface science
  • Astrochemistry
  • Physical chemistry

Background:

  • Amorphous ice is a relevant substrate in astrochemistry and surface science.
  • Understanding molecule-ice interactions is crucial for planetary and interstellar medium studies.

Purpose of the Study:

  • Investigate dicyanoacetylene adsorption on amorphous H(2)O ice at low temperatures.
  • Determine the adsorption site and desorption dynamics of dicyanoacetylene from amorphous ice.

Main Methods:

  • Low-temperature (10 K) adsorption experiments.
  • Temperature-programmed desorption (TPD) to measure desorption activation energy.
  • Analysis of ice restructuring and adsorption site formation.

Main Results:

Related Experiment Videos

  • Dicyanoacetylene forms a s(4) adsorption site on amorphous ice due to ice restructuring.
  • Desorption occurs upon warming, correlating with the onset of ice crystallization.
  • Measured desorption activation energy (42 ± 5 kJ mol⁻¹) aligns with calculated values (46 kJ mol⁻¹).

Conclusions:

  • Dicyanoacetylene forms a stable, hydrogen-bonded adsorbed state on amorphous ice.
  • The interaction induces significant restructuring of the amorphous ice bulk.
  • Desorption mechanism is linked to ice crystallization, providing insights into ice phase transitions.