Publication
- Names
-
- K. Isokoski
- C.~A. Poteet
- H. Linnartz
- Title
- Highly resolved infrared spectra of pure CO$_2$ ice (15-75 K)
- Abstract
- Context. The ν$_2$ bending mode of pure CO$_2$ ice around 15.2 μm exhibits a fine double-peak structure that offers a sensitive probe to study the physical and chemical properties of solid CO$_2$ in space. Current laboratory spectra do not fully resolve the CO$_2$ ice features. Aims: To improve the fitting of the observed CO$_2$ features, high-resolution solid-state infrared spectra of pure CO$_2$ ice are recorded in the laboratory for a series of astronomically relevant temperatures and at an unprecedented level of detail. Methods: The infrared spectra of pure CO$_2$ ice were recorded in the 4000 to 400 cm$^-1$ (2.5-25 μm) region at a resolution of 0.1 cm$^-1$ using Fourier transform infrared spectroscopy. Results: Accurate band positions and band widths (FWHM) of pure CO$_2$ ice are presented for temperatures of 15, 30, 45, 60, and 75 K. The focus of this spectroscopic work is on the CO$_2$ (ν$_2$) bending mode, but more accurate data are also reported for the $^12$CO$_2$ and $^13$CO$_2$ (ν$_3$) stretching mode, and CO$_2$ (ν$_1$+ν$_3$) and (2ν$_2$+ν$_3$) combination bands. FITS files of the spectra are only available at the CDS via anonymous ftp to <A href=``http:// cdsarc.u-strasbg.fr''>http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href=``http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/555/A85''>http://cdsarc.u-strasbg.fr/viz- bin/qcat?J/A+A/555/A85</A>
- Keywords
- spectroscopy, transmission spectra, mid-IR, band position, band width, band vibration mode, ices, molecular solids, amorphous, crystalline, CO2
- Content
- spectral data, band list data, experimental physics
- Year
- 2013
- Journal
- Astronomy and Astrophysics
- Volume
- 555
- Pages
- A85
- Document type
- article
- Publication state
- published
- Doi
- 10.1051/0004-6361/201321517
- Identifiers
-
- bibcode: 2013A&A...555A..85I