Advertisement

Springer Nature is making Coronavirus research free. View research | View latest news | Sign up for updates

On the photochemical formation of CN, C2, and C3 radicals in cometary comae

  • 37 Accesses

  • 20 Citations

Abstract

The formation of cometary CN, C2 and C3 radicals is investigated in a photochemical reaction scheme. From an analysis of the observed brightness profiles of these radicals, it is shown that CN is formed as a primary product in the photolysis of its parent molecules, whereas C2 and C3 are formed via two-step photodissociation of their parents. We suggest that major parent of C2 is different species from those of CN and C3 on the basis of the difference of the variation with heliocentric distance of the sublimation rate of the parents of these radicals. Parent molecules and reaction schemes for the formation of these radicals are discussed.

This is a preview of subscription content, log in to check access.

References

  1. A'Hearn, M. F. and Cowan, J. J.: 1980,The Moon and the Planets 23, 41.

  2. A'Hearn, M. F., Thurber, C. H., and Millis, R. L.: 1977,Astron. J. 82, 518.

  3. Arpigny, C.: 1972,Proc. Tucson Comet Conference, July 1972, eds. G. P. Kuiper and E. Roemer, p. 84.

  4. Brown, L. W.: 1976,The Study of Comets, NASA SP-393, p. 70.

  5. Combi, M. R. and Delsemme, A. H.: 1980,Astrophys. J. 237 641.

  6. Delsemme, A. H.: 1975,Icarus 24, 95.

  7. Delsemme, A. H. and Miller, D. C.: 1971,Planet. Space Sci. 19, 1229.

  8. Haser, L.: 1957,Liege Astrophys. Rep. No. 394.

  9. Herbst, E.: 1978,Protostars and Planets, ed. T. Gehrels, The University of Arizona Press, p. 88.

  10. Huebner, W. F. and Carpenter, C. W.: 1979, LA-8085-MS, Informal Report, Los Alamos Scientific Laboratory.

  11. Huebner, W. F., Snyder, L. E., and Buhl, D.: 1974,Icarus 23, 580.

  12. Jackson, W. M.: 1976a,J. Photochemistry 5, 107.

  13. Jackson, W. M.: 1976b,The Study of Comets, NASA SP-393, p. 679.

  14. Keller, H. U. and Lillie, C. F.: 1974,Astron. Astrophys. 34, 187.

  15. Mendis, D. A. and Ip, W.-H.: 1976,Astrophys. Space Sci. 39, 335.

  16. Shul'man, L. M.: 1972,The Motion, Evolution of Orbits, and Origin of Comets, eds. G. A. Chebotarev, H. J. Kazimirchak-Polonskaya, and B. G. Marsden,IAU Symp. 45, 265.

  17. Stief, L. J.: 1962,Nature 237, 29.

  18. Stief, L. J. and DeCarlo, V. J.: 1965,Nature 205, 1197.

  19. Urlich, B. L. and Conklin, E. K.: 1974,Nature 248, 121.

  20. Whipple, F. L. and Huebner, W. F.: 1976,Ann. Rev. Astron. Astrophys. 14, 143.

  21. Yamamoto, T.: 1981,The Moon and the Planets 24, 175.

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Yamamoto, T. On the photochemical formation of CN, C2, and C3 radicals in cometary comae. The Moon and the Planets 24, 453–463 (1981). https://doi.org/10.1007/BF00896911

Download citation

Keywords

  • Photodissociation
  • Reaction Scheme
  • Photochemical Reaction
  • Heliocentric Distance
  • Parent Molecule