4.2 Article

Mid-IR and VUV spectroscopic characterisation of thermally processed and electron irradiated CO2 astrophysical ice analogues

Journal

JOURNAL OF MOLECULAR SPECTROSCOPY
Volume 385, Issue -, Pages -

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jms.2022.111599

Keywords

Astrochemistry; Mid-IR spectroscopy; VUV spectroscopy; Electron-induced chemistry; Synchrotron radiation

Funding

  1. Europlanet 2024 RI from the European Union Horizon 2020 Research Innovation Programme [871149]
  2. Royal Society [UF130409, RGF/EA/180306, URF/R/191018]
  3. Hungarian Scientific Research Council Fund [K128621]
  4. University of Kent Vice Chancellor's Research Scholarship
  5. VEGA -the Slovak Grant Agency for Science [2/0059/22]
  6. Slovak Research and Development Agency [APVV-19-0072]
  7. Queen Mary University of London
  8. European Union
  9. State of Hungary
  10. European Regional Development Fund [GINOP-2.3.4-15-2016-00004]
  11. Physical Research Laboratory (Department of Space, Government of India)
  12. INSPIRE [IFA-11 CH-11]
  13. Higher Education Department of the Government of West Bengal
  14. Ministry of Science and Technology of Taiwan [108-2113-M-213-003]
  15. Royal Society [UF130409] Funding Source: Royal Society

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The astrochemistry of CO2 ice analogues has been extensively studied due to its prevalence in the interstellar medium and the Solar System. This study investigates the spectroscopic characteristics and chemical changes of pure CO2 ice at different temperatures, as well as the products of electron irradiation. The results indicate that temperature plays a crucial role in determining the spectroscopic properties and chemical reactions of CO2 ice.
The astrochemistry of CO2 ice analogues has been a topic of intensive investigation due to the prevalence of CO2 throughout the interstellar medium and the Solar System, as well as the possibility of it acting as a carbon feedstock for the synthesis of larger, more complex organic molecules. In order to accurately discern the physicochemical processes in which CO2 plays a role, it is necessary to have laboratory-generated spectra to compare against observational data acquired by ground-and space-based telescopes. A key factor which is known to influence the appearance of such spectra is temperature, especially when the spectra are acquired in the infrared and ultraviolet. In this present study, we describe the results of a systematic investigation looking into: (i) the influence of thermal annealing on the mid-IR and VUV absorption spectra of pure, unirradiated CO2 astrophysical ice analogues prepared at various temperatures, and (ii) the influence of temperature on the chemical products of electron irradiation of similar ices. Our results indicate that both mid-IR and VUV spectra of pure CO2 ices are sensitive to the structural and chemical changes induced by thermal annealing. Furthermore, using mid-IR spectroscopy, we have successfully identified the production of radiolytic daughter molecules as a result of 1 keV electron irradiation and the influence of temperature over this chemistry. Such results are directly applicable to studies on the chemistry of interstellar ices, comets, and icy lunar objects and may also be useful as reference data for forthcoming observational missions.

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