Vacuum-Ultraviolet Absorption Spectra of Icy C2H4 at 13–60 K

Jen Iu Lo, Rana Ghosh, Hsiao Chi Lu, Wei Hsiu Hung, Bing Ming Cheng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The thermal variation of absorption spectra of icy ethene in wavelength range 105–220 nm was measured from 13 to 100 K using a synchrotron as light source. Sublimation of icy ethene began above 62 K, resulting in decreasing absorption. The absorption of icy ethene increased at wavelengths less than about 150 nm with increasing temperature from 13 to 60 K, but decreased beyond above 150 nm. According to detailed examination, the absorption spectra of icy ethene intersected at isosbestic point 147.0 nm from 13 to 17 K, whereas those varied absorption profiles crossed at another point, 150.6 nm, from 23 to 60 K. These results indicate that ethene ices might exhibit three structures within temperature range 13–60 K. This work enhances our understanding of the spectra of icy ethene at low temperatures and our knowledge of its astrochemistry and astrophysics in cold astro-environments.

Original languageEnglish
Article number700641
JournalFrontiers in Astronomy and Space Sciences
Volume8
DOIs
Publication statusPublished - 2021 Jun 10

Keywords

  • ethene
  • far-ultraviolet radiation
  • ice
  • synchrotron
  • vacuum-ultraviolet absorption

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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