REACTIVITY OF KETENE UNDER INTERSTELLAR CONDITIONS: FROM THE DILUTE PHASE TO THE CONDENSED PHASE

Krim, Lahouari

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Title

REACTIVITY OF KETENE UNDER INTERSTELLAR CONDITIONS: FROM THE DILUTE PHASE TO THE CONDENSED PHASE

Author(s)

Krim, Lahouari

Contributor(s)

• Guillemin, J.-C.
• Ibrahim, Mohamad

Issue Date

2023-06-23

Keyword(s)

Mini-symposium: Infrared Spectroscopy in the JWST Era

Abstract

The photodecomposition of ketene under interstellar conditions and how the resulting photofragments may recombine in the 3-300 K temperature range could play an important role in investigations related to astrochemistry and astrobiology. Using a combination of bulk ice and rare-gas matrix isolation studies coupled to FTIR spectroscopy, the present work aims to understand the VUV photochemistry of CH₂CO in solid phase to mimic the photochemistry of organic species trapped in the icy interstellar grains. We show that the photolysis of CH₂CO depends strongly on the environments where it is trapped. The VUV photolysis of CH₂CO/Ne in dilute phase leads to kinetically stable and instable species such as CO, C₂H₂, CH₄, C₂H₄, C₂H₆, H₂CO, CH₃CHO, HCCO, C₂O, C₃O, and C₄O. However, the same experiment carried out in condensed phase shows that the photolysis of CH₂CO ice produces mainly an organic residue which is directly observed at 10 K and remains stable in solid phase at 300 K. The IR spectroscopy analysis suggests that the resulting organic residue could be a polyketone formed at 10 K through the VUV photo-polymerization of ketene.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Handle URL

https://hdl.handle.net/2142/122407

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