Astrophysical icy surface simulation under energetic particles and radiation field in formic acid

Astrophysical icy surface simulation under energetic particles and radiation field in formic acid

Autor Andrade, D. P. P. Google Scholar
Boechat-Roberty, H. M. Google Scholar
Silveira, E. F. da Google Scholar
Pilling, S. Google Scholar
Iza, P. Google Scholar
Martinez, R. Google Scholar
Farenzena, L. S. Google Scholar
Homem, M. G. P. Autor UNIFESP Google Scholar
Rocco, M. L. M. Google Scholar
Instituição Universidade Federal do Rio de Janeiro (UFRJ)
Pontificia Univ Catolica Rio de Janeiro
Sincrotron
Universidade Federal de São Paulo (UNIFESP)
Resumo In this work, the fragmentation, survival, and chemical reactions of formic acid (HCOOH) molecules condensed at 56 K are analyzed using plasma desorption mass spectrometry (PDMS) and photon-stimulated ion desorption (PSID) in an effort to simulate the effects of energetic charged particles (e.g., cosmic rays) and radiation fields on interstellar/cometary ices. the measurements were taken at the Brazilian Synchrotron Light Laboratory (LNLS), employing soft X-ray photons (535.1 eV) and energetic ions (similar to 65 MeV) obtained as Cf-252 fission fragments. Mass spectra of positive and negative desorbed ions were obtained using a time-of-flight (TOF) spectrometer, providing information on the fragmentation pattern and abundance of the ionic species released from the icy surface. in both techniques, the major contribution to the released/desorbed ions were positively charged fragments. the production of several series of clusters, some of them with mass/charge ratios of up to 500 u/e, was observed in the PDMS spectra. Comparison between the employed techniques (photon and ion impacts) indicates that the interaction of energetic ions with formic acid ice produces a greater variety of ions than soft X-ray photon impact. This suggests that cosmic rays and high-energy solar wind particles, despite its reduced flux compared to other lower-energy particles, might play an important role in the synthesis of prebiotic molecules.
Idioma Inglês
Data de publicação 2008-08-07
Publicado em Journal of Physical Chemistry C. Washington: Amer Chemical Soc, v. 112, n. 31, p. 11954-11961, 2008.
ISSN 1932-7447 (Sherpa/Romeo, fator de impacto)
Publicador Amer Chemical Soc
Extensão 11954-11961
Fonte http://dx.doi.org/10.1021/jp800297f
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000258147200050
Endereço permanente http://repositorio.unifesp.br/handle/11600/30848

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