Carbon dioxide-methanol intermolecular complexes in interstellar grain mantles

Details Carbon dioxide-methanol intermolecular complexes in interstellar grain mantles Carbon dioxide-methanol intermolecular complexes in interstellar grain mantles

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...351.1066d&link_type=abstract

Astronomy and Astrophysics, v.351, p.1066-1074 (1999)

Astronomy and Astrophysics

Astrophysics

40

Ism: Abundances, Ism: Individual Objects: Rafgl 7009S, Infrared: Ism: Lines And Bands

Scientific paper

We present new laboratory data to interpret the Infrared Space Observatory (ISO) spectra of protostellar objects, and particularly RAFGL7009S. Our experimental results show that solid methanol and carbon dioxide exhibit specific intermolecular interactions. We propose the formation of a Lewis acid-base complex between carbon dioxide and methanol molecules to explain specific substructure of the 15.2 mu m CO_2 bending mode observed in different objects. The various CO_2 bending mode patterns observed in many lines of sight can be interpreted as a combination of both this complex formation and the temperature evolution of the ices. The temperature induced segregation of ice mantles containing CO_2 can be monitored by the 13CO_2 stretching mode shift toward the pure CO_2 ice position. The large width observed for this mode towards interstellar sources partly results from the different temperatures sampled along the line of sight. Given the amount of methanol involved in RAFGL7009S, on the basis of ground based observations, we derive that about half of the so called ``6.85 mu m'' band and a quarter of the 4.9 mu m bands can be accounted for by the deformation modes and 2nu_8 transitions of CH_3OH. Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA

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