 |
| Titel |
Infrared spectra and thermodynamic properties of CO2/methanol ices |
| VerfasserIn |
B. Mate, O. Galvez, V. J. Herrero, R. M. Escribano |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250019958
|
|
|
|
|
|
| Zusammenfassung |
| Ices of mixtures of carbon dioxide and methanol have been studied in a range of temperatures
relevant for comet nuclei, planets and satellites of the solar system and protostellar
environments. We have performed temperature programmed desorption measurements and
recorded infrared spectra of various types of samples. The presence of two slightly different
CO2structures, which can be referred to as “normal” and “distorted”, is put into manifest (1).
If the samples are heated above 130 K, the distorted CO2 sublimates and only the normal
structure remains. The latter can stay trapped until the sublimation of crystalline methanol
(150 K).
The desorption energy of CO2 from methanol ice, and the specific adsorption surface area
of amorphous CH3OH ice have been determined. CO2 does not penetrate into crystalline ice.
CO2/CH3OH ices formed by simultaneous deposition admit two orders of magnitude more
CO2 than sequentially deposited ices. These and other findings will be discussed in the
presentation.
(1) Bel |
|
|
|
|
|
|