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Radiolysis of ammonia-containing ices by heavy cosmic rays inside dense molecular clouds

Published online by Cambridge University Press:  09 March 2010

Sergio Pilling
Affiliation:
Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), 22453-900, Rio de Janeiro, RJ, Brazil. Instituto de Pesquisa e Desenvolvimento (IP&D), Universidade do Vale do Paraíba (UNIVAP), 12244-000, São José dos Campos, SP, Brazil
Eduardo Seperuelo Duarte
Affiliation:
Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), 22453-900, Rio de Janeiro, RJ, Brazil. Centre de recherche sur les ions, les matériaux et la photonique (CEA /CNRS /ENSICAEN /Université de Caen-Basse Normandie), CIMAP-CIRIL-GANIL, Caen, France. Grupo de Física e Astronomia, CEFET/Química de Nilópolis, 12653-060, Nilópolis, Brazil.
Enio F. da Silveira
Affiliation:
Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), 22453-900, Rio de Janeiro, RJ, Brazil.
Emmanuel Balanzat
Affiliation:
Centre de recherche sur les ions, les matériaux et la photonique (CEA /CNRS /ENSICAEN /Université de Caen-Basse Normandie), CIMAP-CIRIL-GANIL, Caen, France.
Hermann Rothard
Affiliation:
Centre de recherche sur les ions, les matériaux et la photonique (CEA /CNRS /ENSICAEN /Université de Caen-Basse Normandie), CIMAP-CIRIL-GANIL, Caen, France.
Alicja Domaracka
Affiliation:
Centre de recherche sur les ions, les matériaux et la photonique (CEA /CNRS /ENSICAEN /Université de Caen-Basse Normandie), CIMAP-CIRIL-GANIL, Caen, France.
Philippe Boduch
Affiliation:
Centre de recherche sur les ions, les matériaux et la photonique (CEA /CNRS /ENSICAEN /Université de Caen-Basse Normandie), CIMAP-CIRIL-GANIL, Caen, France.
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Abstract

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We present experimental studies on the interaction of heavy, highly charged and energetic ions (46 MeV 58Ni13+) with interstellar ammonia-containing (H2O:NH3:CO) ice analog in an attempt to simulate the physical chemistry induced by heavy ion cosmic rays inside dense astrophysical environments. The measurements were performed at the heavy ion accelerator GANIL in Caen, France. In-situ analysis have been performed by a Fourier transform infrared spectrometer. The averaged values for the dissociation cross section of water, ammonia and carbon monoxide are determined and the estimated half life for the studied species inside dense molecular clouds is 2-3 × 106 years. The IR spectra of organic residue produced by the radiolysis have revealed, at room temperature, five bands that are tentatively assigned to vibration modes of the zwitterionic glycine (NH3+CH2COO).

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2010

References

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