Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.309..325m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 309, Issue 2, pp. 325-331.
Astronomy and Astrophysics
Astronomy
4
Molecular Processes, Circumstellar Matter, Ism: Clouds: Dust, Extinction: Infrared: General
Scientific paper
We present 20-110µm absorbance spectra of H2O ice, deposited on amorphous carbon and silicate substrates, obtained over the 10-140K temperature range. The measurements have been carried out in a manner that simulates the deposition, warming and cooling of H2O ice mantles on interstellar and circumstellar grains. For H2O ice films deposited on these substrates we find (i) similar 44-µm-band peak wavelength temperature dependences, (ii) no bandshape differences in the respective spectra, and (iii) a structural phase transition occurring between 120 and 130K. In comparison with published data obtained using a polyethylene substrate, the 52-µm feature (the longitudinal optical mode) observed in our spectra is less prominent. This suggests the presence of material-dependent substrate effects that can alter the appearance of the H2O far-infrared spectrum. The crystallization temperature of H2O ice films deposited on our amorphous silicate substrate is significantly different from that reported by Moore etal. (1994), who found crystallization temperatures down to <20K for ice also deposited on an amorphous silicate substrate. This is attributed to differences in the surface structures of the respective substrates. This may indicate that, at least in the context of laboratory measurements, substrate material composition is not as significant as substrate surface structure.
Duley Walter W.
Maldoni Marco M.
Robinson Garry
Scott Alex
Smith Gary R.
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