Swift heavy ion irradiation of thymine at cryogenic temperature

C. Mejía; G. S.Vignoli Muniz; M. Bender; D. Severin; C. Trautmann; B. Augé; A. N. Agnihotri; P. Boduch; A. Domaracka; H. Rothard

doi:10.1016/j.nimb.2022.10.024

Swift heavy ion irradiation of thymine at cryogenic temperature

C. Mejía
, G. S.Vignoli Muniz
, M. Bender
, D. Severin
, C. Trautmann
, B. Augé
, A. N. Agnihotri
, P. Boduch
, A. Domaracka
, H. Rothard

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

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 ⁴⁸Ca¹⁰⁺ ions. Fourier transform infrared spectroscopy (FTIR) was employed to monitor the degradation of a 2.8 μm thick sample film under irradiation. From the intensity decrease of the infrared absorptions as a function of ion fluence, the destruction cross-section (σ), 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 σ=S_e/D₀, where D₀=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.

Original language	English
Pages (from-to)	11-15
Number of pages	5
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	534
DOIs	https://doi.org/10.1016/j.nimb.2022.10.024
State	Published - 1 Jan 2023

Keywords

Astrochemistry
COMs
Cosmic rays
Infrared spectroscopy
Radiolytic destruction kinetics
Thymine

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10.1016/j.nimb.2022.10.024

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Mejía, C., Muniz, G. S. V., 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. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 534, 11-15. https://doi.org/10.1016/j.nimb.2022.10.024

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title = "Swift heavy ion irradiation of thymine at cryogenic temperature",

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 48Ca10+ ions. Fourier transform infrared spectroscopy (FTIR) was employed to monitor the degradation of a 2.8 μm thick sample film under irradiation. From the intensity decrease of the infrared absorptions as a function of ion fluence, the destruction cross-section (σ), 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 Se as σ=Se/D0, where D0=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.",

keywords = "Astrochemistry, COMs, Cosmic rays, Infrared spectroscopy, Radiolytic destruction kinetics, Thymine",

author = "C. Mej{\'i}a and Muniz, \{G. S.Vignoli\} and M. Bender and D. Severin and C. Trautmann and B. Aug{\'e} and Agnihotri, \{A. N.\} and P. Boduch and A. Domaracka and H. Rothard",

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TY - JOUR

T1 - Swift heavy ion irradiation of thymine at cryogenic temperature

AU - Mejía, C.

AU - Muniz, G. S.Vignoli

AU - Bender, M.

AU - Severin, D.

AU - Trautmann, C.

AU - Augé, B.

AU - Agnihotri, A. N.

AU - Boduch, P.

AU - Domaracka, A.

AU - Rothard, H.

PY - 2023/1/1

Y1 - 2023/1/1

N2 - 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 48Ca10+ ions. Fourier transform infrared spectroscopy (FTIR) was employed to monitor the degradation of a 2.8 μm thick sample film under irradiation. From the intensity decrease of the infrared absorptions as a function of ion fluence, the destruction cross-section (σ), 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 Se as σ=Se/D0, where D0=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.

AB - 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 48Ca10+ ions. Fourier transform infrared spectroscopy (FTIR) was employed to monitor the degradation of a 2.8 μm thick sample film under irradiation. From the intensity decrease of the infrared absorptions as a function of ion fluence, the destruction cross-section (σ), 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 Se as σ=Se/D0, where D0=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.

KW - Astrochemistry

KW - COMs

KW - Cosmic rays

KW - Infrared spectroscopy

KW - Radiolytic destruction kinetics

KW - Thymine

UR - https://www.scopus.com/pages/publications/85141918918

U2 - 10.1016/j.nimb.2022.10.024

DO - 10.1016/j.nimb.2022.10.024

M3 - Artículo

AN - SCOPUS:85141918918

SN - 0168-583X

VL - 534

SP - 11

EP - 15

JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

ER -

Swift heavy ion irradiation of thymine at cryogenic temperature

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