Inner-Shell Ionizations in the Interstellar Medium

  • Jon C. Weisheit
Conference paper


An understanding of the dynamics of interstellar matter and of the formation of stars requires in part knowledge of the ionizing processes in interstellar clouds and in the intercloud medium. Observations1,2 now indicate that the ionization rate per hydrogen atom, ζH, is at least 2 x 10-15 sec-1 in both interstellar regimes, and that the cloud and intercloud temperatures are typically 100°K and 10,000°K, respectively. Given these temperatures, some nonthermal mechanism must be invoked to explain this large value of ζH; however, there exists no direct observational evidence of any such mechanism.


Interstellar Medium Ionization Rate Ionization Cross Section Equivalent Width Ionization Equilibrium 
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  1. 1.
    R. H. Hjellming, C. P. Gordon, and K. J. Gordon, Astron. and Astrophys. 2, 202 (1969).ADSGoogle Scholar
  2. 2.
    M. P. Hughes, A. R. Thompson, and R. S. Colvin, Astrophys. J. Suppl. 23, 323, (1971).ADSCrossRefGoogle Scholar
  3. 3.
    A. Dalgarno and R. A. McCray, Ann. Rev. and Astrophys. 10 (Palo Alto, Calif.; Annual Reviews, Inc.) in press; and references cited therein.Google Scholar
  4. 4.
    J. Silk, Astrophys. Letters 5, 283 (1970).ADSGoogle Scholar
  5. 5.
    J. Silk and R. L. Brown, Astrophys. J. 163, 495 (1971).ADSCrossRefGoogle Scholar
  6. 6.
    J. Silk, Space Science Rev. 11, 671 (1970); and references cited therein.Google Scholar
  7. 7.
    L. Spitzer and M. G. Tomasko, Astrophys. J. 152, 971 (1968).ADSCrossRefGoogle Scholar
  8. 8.
    G. B. Field, D. W. Goldsmith, and H. J. Habing, Astrophys. J. 158, 173 (1969).ADSCrossRefGoogle Scholar
  9. 9.
    J. Silk and M. W. Werner, Astrophys. J. 158, 185 (1969).ADSCrossRefGoogle Scholar
  10. 10.
    R. A. Sunyaev, Astron. Zh. 46, 929 (1969).ADSGoogle Scholar
  11. 11.
    C. Bottcher, R. A. McCray, M. Jura, and A. Dalgarno, Astrophys. Letters 6, 237 (1970).ADSMATHGoogle Scholar
  12. 12.
    R. A. McCray and J. Schwarz, The Gum Nebula and Related Problems, ed. S. P. Maran, J. C. Brandt, T. P. Stecher, NASA 11-83-71-374, (1971).Google Scholar
  13. 13.
    M. Jura and A. Dalgarno, Astrophys. J. 174, 365 (1972).ADSCrossRefGoogle Scholar
  14. 14.
    J. Schwarz, unpublished thesis (Harvard U.), (1972).Google Scholar
  15. 15.
    J. C. Weisheit and A. Dalgarno, submitted to Astrophys. Letters (1972).Google Scholar
  16. 16.
    J. D. Garcia, E. Gerjuoy, and J. E. Welker, Phys. Rev. 165, 66 (1968).ADSCrossRefGoogle Scholar
  17. 17.
    J. D. Garcia, Phys. Rev. A1, 1 (1970).Google Scholar
  18. 18.
    W. J. Veigele, E. Briggs, L, Bates, E. M. Henry, and B. Bracewell, Defense Nuclear Agency Report No. DNA 2433F (1971).Google Scholar
  19. 19.
    A. J. Bearden, J. Appl. Phys. 37, 1681 (1966).ADSCrossRefGoogle Scholar
  20. 20.
    B. L. Henke, R. White, and B. Lundberg. J. Appl. Phys. 28, 98 (1957).ADSCrossRefGoogle Scholar
  21. 21.
    R. J. W. Henry, Planet, and Space Sci. 15, 1747 (1967).Google Scholar
  22. 22.
    R. J. W. Henry, J. Chem. Phys. 48, 3635 (1968).ADSCrossRefGoogle Scholar
  23. 23.
    A. Burgess and M. J. Seaton, Mon. Not. Roy. Astron. Soc. 120, 121 (I960).Google Scholar
  24. 24.
    W. Hink and H. Paschke, Phys. Rev. A4, 507 (1971); and references cited therein.Google Scholar
  25. 25.
    D. L. Walters and C. P. Bhalla, Phys. Rev. A3, 1919 (1971); and references cited therein.Google Scholar
  26. 26.
    T. Aberg, Phys. Rev. A4, 1735 (1971).ADSCrossRefGoogle Scholar
  27. 27.
    G. B. Field and G. Steigman, Astrophys. J. 166, 59 (1971).ADSCrossRefGoogle Scholar
  28. 28.
    G. Steigman, M. W. Werner, and F. M. Geldon, Astrophys. J. 168, 373 (1971).ADSCrossRefGoogle Scholar
  29. 29.
    P. H. Edmonds and J. B. Hasted, Proc. Phys. Soc. A 84, 99 (1964).ADSCrossRefGoogle Scholar
  30. 30.
    D. Happ and W. E. Francis, J. Chem. Phys. 37, 2631 (1962); and references cited therein.Google Scholar
  31. 31.
    C. B. Tarter, Astrophys. J. 168, 313 (1971), and private communication.Google Scholar
  32. 32.
    W. Smith, private communication (1972).Google Scholar

Copyright information

© Plenum Press, New York 1973

Authors and Affiliations

  • Jon C. Weisheit
    • 1
  1. 1.Lawrence Livermore LaboratoryLivermoreUSA

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