Exploring a dynamical path for C2H and NCO formation in dark molecular clouds

  • Ibrokhim Iskandarov
  • Francesco Antonio GianturcoEmail author
  • Fabio Carelli
  • Ersin Yurtsever
  • Roland Wester
Regular Article


This paper deals with the possible formation of two molecular anions often considered likely components in the physical environments of the interstellar medium (ISM): C2H and NCO. They are both discussed here by computationally following the radiative association (RA) mechanism starting from C2 , H, N and O as partners. The corresponding RA total cross sections produced by the calculations are in turn employed to generate the overall association rates over the relevant range of temperatures. The latter are found to be in line with other molecular ions formed by RA but not large enough to uniquivocally suggest this path as the main route to the anions formation in the ISM. Other possible paths of formation are also analysed and discussed. The presence of resonant structures during the association dynamics for both systems is found by the calculations and their consequences are discussed in some detail in the present study.

Graphical abstract


Molecular Physics and Chemical Physics 


  1. 1.
    S. Stanford, Astrobiology Workshop: Leadership astrobiology, edited by D. Devincenzi et al. (NASA, Washington, D.C., 1997)Google Scholar
  2. 2.
    E. Herbst, Nature 289, 656 (1981)CrossRefADSGoogle Scholar
  3. 3.
    M.C. McCarthy, C.A. Gottlieb, H. Gupta, P. Thaddeus, Astrophys. J. Lett. 652, L141 (2006)CrossRefADSGoogle Scholar
  4. 4.
    J. Cernicharo, M. Guelin, M. Agundez, K. Kawaguchi, M. McCarthy, P. Thaddeus, Astron. Astrophys. 67, L37 (2007)CrossRefADSGoogle Scholar
  5. 5.
    E. Herbst, Y. Osamura, Astrophys. J. 679, 1670 (2008)CrossRefADSGoogle Scholar
  6. 6.
    Y. Harada, E. Herbst, Astrophys. J. 685, 272 (2008)CrossRefADSGoogle Scholar
  7. 7.
    J. Cernicharo, M. Guelin, M. Agundez, M.C. McCarthy, P. Thaddeus, Astrophys. J. Lett. 688, L83 (2008)CrossRefADSGoogle Scholar
  8. 8.
    H. Gupta, S. Bruenken, F. Tamassia, C.A. Gottlieb, M.C. McCarthy, P. Thaddeus, Astrophys. J. Lett. 655, L57 (2007)CrossRefADSGoogle Scholar
  9. 9.
    K. Kawaguchi, R. Fujimori, S. Aimi, S. Takano, E.Y. Okabayashi, H. Gupta, S. Bruenken, C.A. Gottlieb, M.C. McCarthy, P. Thaddeus, Publ. Astron. Soc. Jpn 59, L47 (2007)CrossRefADSGoogle Scholar
  10. 10.
    M. Agundez et al., Astron. Astrophys. 517, L2 (2010)CrossRefADSGoogle Scholar
  11. 11.
    J. Cernicharo, M. Agundez, M. Guelin, The Molecular Universe, in IAU Symp. 280, edited by J. Cernicharo, B. Bachiller (Cambridge University Press, Cambridge, 2011), p. 237Google Scholar
  12. 12.
    J.H. Novozamsky, W.A. Schutte, J.V. Keane, Astron. Astrophys. 379, 588 (2001)CrossRefADSGoogle Scholar
  13. 13.
    V. Schettino, I.C. Hisatsune, J. Chem. Phys. 52, 9 (1970)CrossRefADSGoogle Scholar
  14. 14.
    Y. Morisawa, H. Hoshima, Y. Kato, S. Kuma, N. Sogoshi, M. Fushitami, S. Watanabe, Y. Miyamoto, T. Momose, Y. Kasai, K. Kanagashi, Publ. Astron. Soc. Jpn 57, 325 (2005)CrossRefADSGoogle Scholar
  15. 15.
    M.L. Senent, M. Hochlaf, Astrophys. J. 768, 59 (2013)CrossRefADSGoogle Scholar
  16. 16.
    N. Douguet, S. Fonseca dos Santos, M. Raoult, O. Dulieu, Ann E. Orel, V. Kokoouline, J. Chem. Phys. 142, 234309 (2015)CrossRefADSGoogle Scholar
  17. 17.
    B. Eichelberg, T.P. Snow, C. Barckholtz, V.M. Bierbaum, Astrophys. J. 667, 1283 (2007)CrossRefADSGoogle Scholar
  18. 18.
    S. Bruenken, C.A. Gottlieb, H. Gupta, M.C. McCarthy, P. Thaddeus, Astron. Astrophys. 464, L33 (2007)CrossRefADSGoogle Scholar
  19. 19.
    R.J. Le Roy, LEVEL 8.0 (2007)Google Scholar
  20. 20.
    H.J. Werner, P.J. Knowles, MOLPRO Version 2012.1 (2012)Google Scholar
  21. 21.
    P. Schwerdtfeger, Table of experimental and calculated static dipole polarizabilities for the electronic ground states of the neutral elements, February 11, 2014Google Scholar
  22. 22.
    C. Leonard, H. Gritli, G. Chambaud, J. Chem. Phys. 133, 124318 (2010)CrossRefADSGoogle Scholar
  23. 23.
    G. Herzberg, Molecular Spectra and Molecular Structure, 2nd edn. (D. Van Nostrand Co, 1950)Google Scholar
  24. 24.
    A. Schadee, J. Quantit. Study Radiat. Transfer 19, 517 (1978)CrossRefADSGoogle Scholar
  25. 25.
    K. Smith, The Calculation of Atomic Collision Processes, 1st edn. (Wiley, New York, 1971)Google Scholar
  26. 26.
    F.A. Gianturco, P. Gori Giorgi, Astrophys. J. 479, 560 (1997)CrossRefADSGoogle Scholar
  27. 27.
    S. Bovino, M. Tacconi, F.A. Gianturco, Astrophys. J. 740, 101 (2011)CrossRefADSGoogle Scholar
  28. 28.
    F.A. Gianturco, P. Gori Giorgi, Phys. Rev. A 54, 5 (1996)CrossRefGoogle Scholar
  29. 29.
    P.C. Stancil, A. Dalgarno, Astrophys. J. 479, 543 (1997)CrossRefADSGoogle Scholar
  30. 30.
    M. Jurek, V. Spirko, W.P. Kraemer, Chem. Phys. 193, 287 (1995)CrossRefADSGoogle Scholar
  31. 31.
    G. Barinovs, M.C. van Hemert, Astrophys. J. 636, 923 (2006)CrossRefADSGoogle Scholar
  32. 32.
    A.E. Douglas, G. Herzberg, Astrophys. J. 94, 381 (1941)CrossRefADSGoogle Scholar
  33. 33.
    M. Satta, F.A. Gianturco, F. Carelli, R. Wester, Astrophys. J. 799, 228 (2015)CrossRefADSGoogle Scholar

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Ibrokhim Iskandarov
    • 1
  • Francesco Antonio Gianturco
    • 1
    Email author
  • Fabio Carelli
    • 1
  • Ersin Yurtsever
    • 2
  • Roland Wester
    • 1
  1. 1.Institut für Ionen Physik und Angewandte Physik, Leopold-Franzens-UniversitätInnsbruckAustria
  2. 2.Department of ChemistryKoc UniversityIstanbulTurkey

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