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Ion irradiation of asphaltite as an analogue for solid hydrocarbons in the interstellar medium

Strazzulla, G. and Moroz, L. (2005) Ion irradiation of asphaltite as an analogue for solid hydrocarbons in the interstellar medium. Astronomy and Astrophysics, 434, pp. 593-598.

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Abstract

We present the results of experiments of low temperature ion irradiation of pure asphaltite samples and those covered with water ice layers. Asphaltite (a natural bitumen) was used as an analogue of carbonaceous interstellar grains on which water-rich icy mantles can be formed in the dense and cold phases of the interstellar medium. We simulated irradiation by cosmic ions in the laboratory to study, by in situ infrared spectroscopy, the formation of molecular species in the asphaltite samples and at the interface between the refractory solid (asphaltite) and the water ice mantle. New molecular species were formed at the expense of water molecules and atoms (mainly carbon and hydrogen) from the asphaltite substrate. The vibration modes we detected at low temperature (16 K) include: C-H stretch (carbynoids), C-H asymmetric stretch (acetylene), C-H aromatic stretch, C=O stretch in CO<sub>2</sub>, C≡O stretch in CO, and C≡C stretch (carbynoids). Some of these species remain stable after warming of the irradiated samples to room temperature.

Document Type:Article
Title:Ion irradiation of asphaltite as an analogue for solid hydrocarbons in the interstellar medium
Authors:
AuthorsInstitution or Email of Authors
Strazzulla, G.INAF- Catania Astrophysical Observatory
Moroz, L.UNSPECIFIED
Date:2005
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:434
Page Range:pp. 593-598
Status:Published
Keywords:astrochemistry, dust, extinction, ISM, molecules, laboratory, spectroscopy
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W -- no assignement (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Dr. Liubov Moroz
Deposited On:15 Dec 2006
Last Modified:27 Apr 2009 13:21

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