Astrophysics and Space Science

, Volume 113, Issue 2, pp 365–371 | Cite as

The formation of interstellar H2 on transition metal grains

  • D. J. Yu
  • M. T. Zhou
  • Q. Zeng
  • Q. Q. Gou
Article
  • 25 Downloads

Abstract

Semi-empirical SCF-MO method — CNDO/2 is extended to transition element iron. The chemical adsorption energy of atom H and the desorption activation energy of molecule H2 on a iron grain surface are computed using a cluster model. The weak chemical adsorption energy of H and the desorption activation energy of H2 on a nickel grain surface are also calculated by assuming a configuration 3s23p63d10 for the Ni-atom in solid state. In a diffuse cloud, which is near a strong interstellar radiation field, according to the kinetic theory of chemical reactions, the formation rates of H2 on Fe and Ni grain surfaces are estimated. The functions of dielectric grains and Ni, Fe grains on the formation of interstellar H2 are discussed.

Keywords

Iron Nickel Activation Energy Solid State Formation Rate 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Brecher, A. and Arrhenius, G.: 1971,Nature Phys. Sci. 230, 107.Google Scholar
  2. Clementi, E. and Raimondi, D. L.: 1963,J. Chem. Phys. 38, 2686.Google Scholar
  3. Hollenbach, D. J. and Salpeter, E. E.: 1971,Astrophys. J. 163, 155.Google Scholar
  4. Pople, J. A. and Segal, G. A.: 1966,J. Chem. Phys. 44, 3289.Google Scholar
  5. Pople, J. A. and Beveridge, D. L.: 1970,Approximate Molecular Orbital Theory, McGraw-Hill, New York.Google Scholar
  6. Slater, J. C.: 1930,Phys. Rev. 36, 57.Google Scholar
  7. Tabak, R. G.: 1977,Astrophys. Space Sci. 49, 41.Google Scholar
  8. Tabak, R. G.: 1978a,Astrophys. Space Sci. 53, 279.Google Scholar
  9. Tabak, R. G.: 1978b,Astrophys. Space Sci 54, 211.Google Scholar
  10. Tabak, R. G. and Straitiff, A. K.: 1983,Astrophys. Space Sci. 93, 199.Google Scholar
  11. Wang, Z. Z.: 1981,J. Jilin Univ. 1, 114.Google Scholar
  12. Winnewisser, G., Churchwell, E., and Walmsley, C. M.: 1979, in G. W. Chantry (ed.),Modern Aspects of Microwave Spectroscopy, Academic Press, London, p. 313.Google Scholar

Copyright information

© D. Reidel Publishing Company 1985

Authors and Affiliations

  • D. J. Yu
    • 1
  • M. T. Zhou
    • 2
  • Q. Zeng
    • 3
  • Q. Q. Gou
    • 4
  1. 1.Institute of Space PhysicsPekingChina
  2. 2.Changsha Institute of TechnologyChina
  3. 3.Purple Mountain ObservatoryNankingChina
  4. 4.Scientific and Technical University of ChengduChina

Personalised recommendations