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Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment
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Atomic oxygen diffusion on and desorption from amorphous silicate surfaces.

Jiao He1, Dapeng Jing, Gianfranco Vidali

  • 1Physics Department, Syracuse University, Syracuse, NY 13244-1130, USA. gvidali@syr.edu.

Physical Chemistry Chemical Physics : PCCP
|January 18, 2014
PubMed
Summary
This summary is machine-generated.

Atomic oxygen diffusion on silicate surfaces begins around 40-50 K. A higher atomic oxygen desorption energy was found, potentially resolving discrepancies in interstellar molecular oxygen abundance.

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Area of Science:

  • Astrochemistry
  • Surface Science
  • Astrophysics

Background:

  • Surface reactions involving atomic oxygen are crucial in astrophysics and astrochemistry.
  • Fundamental processes like atomic oxygen diffusion and desorption on surfaces remain poorly understood.
  • Discrepancies exist between observed and modeled abundances of molecular oxygen in space.

Purpose of the Study:

  • To investigate the diffusion and desorption of atomic oxygen on amorphous silicate surfaces.
  • To simulate interstellar conditions to understand surface processes.
  • To determine the desorption energy of atomic oxygen and its implications for astrochemistry.

Main Methods:

  • Utilized a radio-frequency dissociated oxygen beam for experiments under simulated interstellar conditions.
  • Performed temperature-programmed desorption (TPD) experiments to study ozone formation.
  • Employed a rate equation model to analyze surface kinetics.

Main Results:

  • Atomic oxygen diffusion on amorphous silicate surfaces was observed to begin significantly between 40 K and 50 K.
  • The desorption energy of atomic oxygen was determined to be 152 ± 20 meV (1764 ± 232 K).
  • This determined desorption energy is considerably higher than previously accepted values.

Conclusions:

  • The study provides new insights into atomic oxygen surface diffusion and desorption kinetics.
  • The newly determined high atomic oxygen desorption energy may resolve discrepancies in interstellar molecular oxygen abundance.
  • This research contributes to a better understanding of chemical processes in interstellar environments.