Mejía, C. ; Muniz, G. S. Vignoli ; Bender, M. ; Severin, D. ; Trautmann, C. ; Augé, B. ; Agnihotri, A.N. ; Boduch, P. ; Domaracka, A. ; Rothard, H. (2023)
Swift heavy ion irradiation of thymine at cryogenic temperature.
In: Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 534
doi: 10.1016/j.nimb.2022.10.024
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Thymine (C5H6N2O2) is a basic N-heterocyclic nucleobase in all known organisms, and this molecule is also found in meteoritic materials. This study aims to investigate thymine's physical and chemical modifications under ion irradiation in cryogenic conditions. Space radiation was simulated by exposing thymine at 27 K to 230 MeV Ca-48(10+) ions. Fourier transform infrared spectroscopy (FTIR) was employed to monitor the degradation of a 2.8 mu m thick sample film under irradiation. From the intensity decrease of the infrared absorptions as a function of ion fluence, the destruction cross-section (sigma), required to dissociate or eject a thymine molecule, is deduced by an exponential function. The physical and chemical modifications induced by energetic projectiles can be related to the electronic stopping power S-e as sigma = S-e/D-0, where D-0 = 9.6 +/- 0.4 eV/molecule is the effective mean dose needed to destroy the thymine molecule at 27 K. Also, new molecular species formed under irradiation are observed and, based on infrared spectra, identified as CN-, OCN-, HCNO, and CO.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Mejía, C. ; Muniz, G. S. Vignoli ; Bender, M. ; Severin, D. ; Trautmann, C. ; Augé, B. ; Agnihotri, A.N. ; Boduch, P. ; Domaracka, A. ; Rothard, H. |
| Art des Eintrags: | Bibliographie |
| Titel: | Swift heavy ion irradiation of thymine at cryogenic temperature |
| Sprache: | Englisch |
| Publikationsjahr: | 1 Januar 2023 |
| Verlag: | Elsevier |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms |
| Jahrgang/Volume einer Zeitschrift: | 534 |
| DOI: | 10.1016/j.nimb.2022.10.024 |
| Kurzbeschreibung (Abstract): | Thymine (C5H6N2O2) is a basic N-heterocyclic nucleobase in all known organisms, and this molecule is also found in meteoritic materials. This study aims to investigate thymine's physical and chemical modifications under ion irradiation in cryogenic conditions. Space radiation was simulated by exposing thymine at 27 K to 230 MeV Ca-48(10+) ions. Fourier transform infrared spectroscopy (FTIR) was employed to monitor the degradation of a 2.8 mu m thick sample film under irradiation. From the intensity decrease of the infrared absorptions as a function of ion fluence, the destruction cross-section (sigma), required to dissociate or eject a thymine molecule, is deduced by an exponential function. The physical and chemical modifications induced by energetic projectiles can be related to the electronic stopping power S-e as sigma = S-e/D-0, where D-0 = 9.6 +/- 0.4 eV/molecule is the effective mean dose needed to destroy the thymine molecule at 27 K. Also, new molecular species formed under irradiation are observed and, based on infrared spectra, identified as CN-, OCN-, HCNO, and CO. |
| Freie Schlagworte: | astrochemistry, infrared spectroscopy, cosmic rays, COMs, thymine, radiolytic destruction kinetics |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Ionenstrahlmodifizierte Materialien |
| Hinterlegungsdatum: | 26 Feb 2024 07:41 |
| Letzte Änderung: | 26 Feb 2024 13:14 |
| PPN: | 515816078 |
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