Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...321..618s&link_type=abstract
Astronomy and Astrophysics, v.321, p.618-624
Astronomy and Astrophysics
Astrophysics
16
Ism: Dust, Ism: Molecules, Infrared: Interstellar: Lines
Scientific paper
We continue to study the effects of ion irradiation on frozen ices with a view to their astrophysical relevance. The technique used to evidence molecular alteration is "in situ" infrared (IR) spectroscopy. Here, we present results obtained irradiating by 3-60 keV helium and argon ions, frozen CO, and mixtures CO:O_2_ and CO:N_2_. The relevance of these studies for astrophysical applications is related to the fact that IR bands of frozen O_2_ and N_2_ are difficult to be observed. We investigate if their presence on ice mantles of interstellar grains could be evidenced through the changes in the CO profile or the presence of new species formed by energetic processing. The results indicate that the CO band at around 2140cm^-1^ is only slightly modified by the simple mixing with the two non-polar species and, more deeply, by ion irradiation of the mixtures. Carbon dioxide (CO_2_) is the major species produced by irradiation. In CO:O_2_ mixtures ozone (O_3_) is produced at a large rate. Also carbon suboxides are formed by ion irradiation of CO and CO:N_2_ mixtures, the profile of their bands is different in the two cases and can be used as tracer of the presence of N_2_ in icy mantles.
Brucato John Robert
Palumbo Maria Elisabetta
Satorre M. A.
Strazzulla Giovanni
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