Detection of an absorption feature at the position of the 4.27-μm band of solid CO_2_.

Details Detection of an absorption feature at the position of the 4.27-μm band of solid CO_2_. Detection of an absorption feature at the position of the 4.27-μm band of solid CO_2_.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315l.189g&link_type=abstract

Astronomy and Astrophysics, v.315, p.L189-L192

Astronomy and Astrophysics

Astrophysics

40

Ism: Dust, Extinction, Infrared: Ism: Lines And Bands

Scientific paper

We report observations of 13 young infrared sources associated with molecular clouds with ISO's spectrophotometer ISOPHOT-S in the wavelength range from 2.5 to 11.6μm. In addition to a number of well-known interstellar bands due to various molecular ices, a new band at 4.27μm was detected, which is very likely attributed to C=O stretching vibrations of solid CO_2_. This new band is seen in all our sources. Thus, CO_2_ seems to be a common constituent of icy grain mantles in molecular clouds. The strength of the band increases with the strengths of the CO and H_2_O bands. We estimate that CO_2_ and CO may be present in comparable amounts in the mantles. The implications for the models of interstellar chemistry are briefly discussed.

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