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Spectroscopic measurements of Si-O recombination process in laser-induced quartz vapor plumes

Earth, Planets and Space volume 59, pages 437–451 (2007)Cite this article

Abstract

The thermal dissociation of SiO2 in impact-induced vapor is very important because it controls the redox state of the vapor. However, the thermal dissociation of SiO2 and its recombination are not well understood. The present study investigates experimentally the kinetics of the Si-O recombination process at high temperatures. Laser-induced quartz vapor is observed by means of time-resolved spectroscopy, and the atomic lines of Si and molecular bands of SiO are measured in order to estimate the temperature and the column densities of Si and SiO. The results of these experiments show that Si and O recombine as the vapor cools from 5000 to 3000 K. A comparison of the observed chemical composition and equilibrium calculations suggests that the recombination reaction between Si and O proceeds rather efficiently under a condition that differs significantly from the thermo-chemical equilibrium. This result is explained well if the rate constant of the Si-O recombination process does not depend strongly on the temperature; the activation energy is very small. These results suggest that the Si-O recombination process may not be approximated by a frequently-used ‘freeze-out’ model.

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Author notes

  1. Masanori Fuyuki

    Present address: Genesis Research Institute, Inc., Futamata 717-86, Chiba, 272-0001, Japan

Authors and Affiliations

  1. Department of Complexity Science and Engineering, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan

    Masanori Fuyuki, Seiji Sugita & Takafumi Matsui

  2. Institute for Frontier Research on Earth Evolution, Japan Marine Science and Technology Center, 2-15 Natsushima-cho, Yokosuka-city, Kanagawa, 237-0061, Japan

    Toshihiko Kadono

  3. Research Division for Planetary Science, The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa, 229-8510, Japan

    Sunao Hasegawa

Authors
  1. Masanori Fuyuki
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  2. Seiji Sugita
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  3. Toshihiko Kadono
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  4. Sunao Hasegawa
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  5. Takafumi Matsui
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Correspondence to Masanori Fuyuki.

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Fuyuki, M., Sugita, S., Kadono, T. et al. Spectroscopic measurements of Si-O recombination process in laser-induced quartz vapor plumes. Earth Planet Sp 59, 437–451 (2007). https://doi.org/10.1186/BF03352705

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  • DOI: https://doi.org/10.1186/BF03352705

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