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Astron. Astrophys. 315, L341-L344 (1996)

A laboratory database of solid CO and CO2 for ISO*

P. Ehrenfreund1, A.C.A. Boogert2, P.A. Gerakines1,3, D.J. Jansen1, W.A. Schutte1, A.G.G.M. Tielens4, and E.F. van Dishoeck1

1 Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, The Netherlands
2 Kapteyn Astronomical Institute, P.O. Box 800, 9700 AV Groningen, The Netherlands
3 Department of Physics, Applied Physics & Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA
4 NASA Ames Research Center, Mail Stop 245-6, Moffett Field, CA 94035, USA

Received 15 July 1996 / Accepted 22 August 1996

Abstract. We present laboratory measured infrared spectra of mixtures containing CO and CO2 at low temperatures. The profiles and peak position of the absorption features due to these species are very sensitive to molecular environment, temperature, irradiation history and particle shape. Illustrative examples of these variations are briefly discussed.

We have compiled datafiles containing the laboratory spectra, derived optical constants, as well as extinction efficiency calculations for small grains. These files can be retrieved from the WWW in various formats after November 1st, 1996, under http://www.strw.leidenuniv.nl/~ehrenfreund/isodb. Together with astronomical spectra taken by the ISO satellite these laboratory data will be valuable for the determination of the grain mantle composition and grain evolution in dense clouds.

Key words: ISM: molecules - dust - infrared: interstellar: lines

* 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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