Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cajph..81..217p&link_type=abstract
Can. J. Phys. 81, 217-224
Astronomy and Astrophysics
Astrophysics
3
Scientific paper
We studied, by infrared absorption spectroscopy, icy samples (16 K) of pure water, a mixture N2:H2O=100:1, and a sample made of N2 condensed on water ice and diffused in it after warm up to 30 K. We concentrated our efforts in two spectral regions around 3700 cm-1 where the feature due to the O-H dangling bonds in porous amorphous water falls and around 5000 cm-1 where a broad water band is present. We found that in the N2:H2O=100:1 mixture the profile of the broad water feature at about 5000 cm-1 dramatically changed to a very narrow band at about 5300 cm-1. When N2 diffuses in water ice a feature at about 5300 cm-1 appears along with the broad 5000 cm-1 band. We also studied some of the effects of ion irradiation(Ar++, 60 keV ions) on these icy samples. We found that after processing the feature due to the O-H dangling bonds it reduced in intensity and eventually disappeared. Here we present the experimental results, discuss their astrophysical relevance and suggest that a band at about 5300 cm-1 (1.88 μm) should be searched for on icy surfaces in the outer Solar System, namely Pluto, Triton, Edgeworth-Kuiper Belt Objects, and Centaurs.
Palumbo Maria Elisabetta
Strazzulla Giovanni
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