Ratio Of Otho/para-formaldehyde Sublimated From Energetically Processed Interstellar Ice Analogs
Yocum, Katarina
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https://hdl.handle.net/2142/116678
Description
Title
Ratio Of Otho/para-formaldehyde Sublimated From Energetically Processed Interstellar Ice Analogs
Author(s)
Yocum, Katarina
Contributor(s)
Gerakines, Perry A.
Milam, Stefanie N.
Wilkins, Olivia H.
Issue Date
2022-06-24
Keyword(s)
Astronomy
Abstract
The ortho-to-para ratios (OPRs) of interstellar molecules with symmetric hydrogen nuclei are thought to provide information about their thermal and chemical history. The OPR of formaldehyde (H$_{2}$CO) is sometimes used to predict whether this compound formed on a cold interstellar grain or in the gas phase at warmer temperatures, but the full meaning of the OPR detected in interstellar space is still a topic of debate. This work aims to unravel more information about the OPR of H$_{2}$CO formed on icy interstellar grains through laboratory experiments. In these experiments, the OPR of H$_{2}$CO is measured using submillimeter spectroscopy after low-temperature formation by ultraviolet photolysis of interstellar ice analog samples containing water (H$_{2}$O), carbon monoxide (CO), and/or methanol (CH$_{3}$OH). The experimental approach and preliminary results will be discussed.
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