Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.168g&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astrophysics
Scientific paper
Water-ice represents the largest fraction of icy mantles and it has been shown to be everywhere in the Universe. The relative average abundance of elemental deuterium to hydrogen is around 1.5 10-5 (1), and consequently, according to this value, different models predict abundance of HDO in the ice mantles of the order of 1 to 6% in dense cloud cores. Such concentrations could be accessible to observation by scrutiny from infrared space and terrestrial telescopes. Laboratory studies of deuterated icy materials which could serve as analogues for astrophysical particles are necessary to correctly interpret these spectra. During the last years, our group has employed infrared spectroscopy techniques to characterize different ice mixtures of astrophysical interest (see e.g. 2,3). In this presentation, we will show infrared spectra of D2O embedded in amorphous or crystalline H2O ice matrices at low temperatures (ranging from 14 K to 150 K). We have observed isotopic exchange at temperatures above 100 K, but the amount and rate of production of HOD species depend on both the generation conditions of the ices and their temperature evolution. Special attention has been paid to the changes in the infrared spectra of the O-D stretching band with temperature, which have a clear astrophysical implication in the detection of this band in different astrophysical objects.
Escribano Rafel
Gálvez O.
Herrero Víctor J.
Maté Belén
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