Infrared spectra and optical constants of astronomical ices: III. Propane, propylene, and propyne

Hudson, R. L., Gerakines, P. A., Yarnall, Y. Y. and Coones, R. T. ORCID: https://orcid.org/0000-0001-6651-4707 (2021) Infrared spectra and optical constants of astronomical ices: III. Propane, propylene, and propyne. Icarus, 354. 114033. ISSN 0019-1035 doi: 10.1016/j.icarus.2020.114033

Abstract/Summary

Infrared (IR) spectra of the hydrocarbon ices C3H8 (propane), C3H6 (propylene, propene), and C3H4 (propyne, methylacetylene) are relevant to the study of the low-temperature chemistry and spectroscopy of objects within and beyond the Solar System, but IR band strengths and absorption coefficients are lacking for these compounds. Here we present new IR spectra of crystalline and non-crystalline forms of C3H8, C3H6, and C3H4. Measurements of ice density and refractive index also are reported, two quantities needed to compute IR absorption coefficients, band strengths, optical constants, and, ultimately, abundances of propane, propylene, and propyne in extraterrestrial environments and in laboratory experiments. Suggestions and interpretations are offered regarding the multiple crystalline forms of propane and propylene observed. Applications and extensions are described.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/92469
Identification Number/DOI	10.1016/j.icarus.2020.114033
Refereed	Yes
Divisions	Life Sciences > School of Chemistry, Food and Pharmacy > School of Pharmacy > Pharmaceutics Research Group
Publisher	Elsevier
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