Physics
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996p%26ss...44..973q&link_type=abstract
Planetary and Space Science, v. 44, p. 973-986.
Physics
19
Scientific paper
Near infrared spectroscopic observations of icy surfaces provide powerful keys to identify specific molecules, and to derive information about the physical and chemical states of the surface ices. In particular, the high spectral resolution recently achievable in astronomical spectra, opens a new insight, but also implies that the complete analysis of these spectra requires careful spectroscopic studies, i.e. clean and systematic laboratory experiments associated with a rigorous interpretation of the spectra. Spectroscopic interpretation is focused on, taking into consideration the specific physical aspects of some ices (molecular solids). It is shown how this analysis allows specific astrophysical problems to be solved. At first, some relevant fundamentals of physics and spectroscopy of molecular solids are presented. The spectroscopy of these solids largely belongs to molecular physics, but also involves solid state effects (Davydov splitting, LO-TO splitting, etc.) which have to be considered to correctly assign spectra, as well as to understand the behaviour of the spectral profile of the bands as a function of various physical parameters. The specific treatment needed to explain the structure of combination and overtone bands occurring in the whole infrared range is particularly focused on. Those theoretical considerations are applied to two different problems concerning surface ices: the first one deals with the identification of two narrow SO2 bands on Io (Schmitt et al., Icarus 111, 79-105, 1994), the second one with the physical state of N2 ice on Triton and Pluto. In a second step, the first results are presented of a systematic spectroscopic study in the near infrared on the two-phase system N2:CH4 for CH4 concentrations ranging from 0.1 to 10%. This study was initiated with the view of investigating the question of the physical state of the surface of Pluto. It is shown that it is possible to investigate the N2:CH4 phase diagram using the spectral profile of both the ν1 + ν4 and the ν3 + ν4 bands of CH4. Finally, the physical parameters (temperature, crystalline phase, etc.) that are expected to be extracted from a detailed analysis of near infrared observations of icy planetary surfaces are briefly reviewed.
Bini Roberto
Quirico Eric
Salvi Pier Remigio
Schmitt Bernard
No associations
LandOfFree
Spectroscopy of some ices of astrophysical interest: SO2, N2 and N2:CH4 mixtures does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spectroscopy of some ices of astrophysical interest: SO2, N2 and N2:CH4 mixtures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectroscopy of some ices of astrophysical interest: SO2, N2 and N2:CH4 mixtures will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-995463