The peak position and full width at half maximum of selected acetone bands have been measured for different ice mixtures and temperatures. A large set of IR spectra of acetone-containing ices is presented and made available as a basis for interpreting current and future infrared astronomical spectra. The changes in the infrared features for varying conditions were analyzed. Spectra of the ices at higher temperatures are acquired during the heating of the sample (at a rate of 25 K h −1) up to 160 K. Acetone-containing ices were grown at 15 K under high-vacuum conditions and infrared (IR) spectra (500–4000 cm −1/20–2.5 μm, 0.5 cm −1 resolution) in transmission mode were recorded using a Fourier transform infrared spectrometer. This work also points out the IR features that are considered the best promising tracers when searching for interstellar acetone-containing ices. Changes in the band positions and shapes due to variations in the temperature, ice composition, and morphology are reported. This work is aimed at characterizing the infrared features of acetone mixed in ice matrices containing H 2O, CO 2, CO, CH 4, and CH 3OH for temperatures ranging between 15 K and 160 K. These reflect the environmental conditions in which COMs are thought to be found.Īims.
#Ir spectrum table series
This paper is part of a series of laboratory studies focusing on the infrared spectra of frozen COMs embedded in ice matrices. In order to identify features of solid-state molecules in astronomical spectra, laboratory infrared spectra of COMs within astronomically relevant conditions are required. The higher sensitivity, spectral and spatial resolution of the JWST will allow for the probing of the chemical inventory of ices in star-forming regions. With the upcoming launch of the James Webb Space Telescope (JWST), this situation may change.
Although these species are formed in the icy mantles that cover dust grains, the most complex species that has been unambiguously identified in the solid-phase to date is methanol (CH 3OH). Complex organic molecules (COMs) have been largely identified through their characteristic rotational transitions in the gas of interstellar and circumstellar regions. Laboratory for Astrophysics, Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The NetherlandsĮ-mail: Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The NetherlandsĬontext. Astronomical objects: linking to databases.Including author names using non-Roman alphabets.Suggested resources for more tips on language editing in the sciences Punctuation and style concerns regarding equations, figures, tables, and footnotes
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