Evaluation of the degradation cross-cection as stopping power dependence for pure and mixture molecular samples at cryogenic temperatures

A. L.F. de Barros; C. Mejia; D. V. Doreste; A. Domaracka; P. Boduch; H. Rothard; E. F. da Silveira

doi:10.1016/j.nimb.2025.165926

Evaluation of the degradation cross-cection as stopping power dependence for pure and mixture molecular samples at cryogenic temperatures

A. L.F. de Barros
, C. Mejia
, D. V. Doreste
, A. Domaracka
, P. Boduch
, H. Rothard
, E. F. da Silveira

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

Abstract

Ices in interstellar and planetary environments are constantly altered by cosmic radiation. Using FTIR spectroscopy, we analyse radiation-induced changes in ices containing H₂O, CO, CO₂, and CH₃OH, molecules abundant in the Solar System and interstellar medium. Molecular degradation is quantified by apparent cross-sections that scale with the electronic stopping power (S_e). Literature data reveal a power-law dependence, σ_d ∝ S_eⁿ, influenced by thickness, sputtering yield, and radiochemical effects. This empirical relationship serves as a benchmark for assessing molecular stability and the interplay between sputtering and radiolysis, improving models of chemical evolution in astrophysical ices.

Original language	English
Article number	165926
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	570
DOIs	https://doi.org/10.1016/j.nimb.2025.165926
State	Published - Jan 2026

Keywords

Astrochemistry
Circumstellar clouds
Methods: Laboratory ion irradiation
Molecules

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10.1016/j.nimb.2025.165926

Cite this

de Barros, A. L. F., Mejia, C., Doreste, D. V., Domaracka, A., Boduch, P., Rothard, H., & da Silveira, E. F. (2026). Evaluation of the degradation cross-cection as stopping power dependence for pure and mixture molecular samples at cryogenic temperatures. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 570, Article 165926. https://doi.org/10.1016/j.nimb.2025.165926

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title = "Evaluation of the degradation cross-cection as stopping power dependence for pure and mixture molecular samples at cryogenic temperatures",

abstract = "Ices in interstellar and planetary environments are constantly altered by cosmic radiation. Using FTIR spectroscopy, we analyse radiation-induced changes in ices containing H2O, CO, CO2, and CH3OH, molecules abundant in the Solar System and interstellar medium. Molecular degradation is quantified by apparent cross-sections that scale with the electronic stopping power (Se). Literature data reveal a power-law dependence, σd ∝ Sen, influenced by thickness, sputtering yield, and radiochemical effects. This empirical relationship serves as a benchmark for assessing molecular stability and the interplay between sputtering and radiolysis, improving models of chemical evolution in astrophysical ices.",

keywords = "Astrochemistry, Circumstellar clouds, Methods: Laboratory ion irradiation, Molecules",

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year = "2026",

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doi = "10.1016/j.nimb.2025.165926",

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de Barros, ALF, Mejia, C, Doreste, DV, Domaracka, A, Boduch, P, Rothard, H & da Silveira, EF 2026, 'Evaluation of the degradation cross-cection as stopping power dependence for pure and mixture molecular samples at cryogenic temperatures', Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, vol. 570, 165926. https://doi.org/10.1016/j.nimb.2025.165926

Evaluation of the degradation cross-cection as stopping power dependence for pure and mixture molecular samples at cryogenic temperatures. / de Barros, A. L.F.; Mejia, C.; Doreste, D. V. et al.
In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 570, 165926, 01.2026.

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

TY - JOUR

T1 - Evaluation of the degradation cross-cection as stopping power dependence for pure and mixture molecular samples at cryogenic temperatures

AU - de Barros, A. L.F.

AU - Mejia, C.

AU - Doreste, D. V.

AU - Domaracka, A.

AU - Boduch, P.

AU - Rothard, H.

AU - da Silveira, E. F.

PY - 2026/1

Y1 - 2026/1

N2 - Ices in interstellar and planetary environments are constantly altered by cosmic radiation. Using FTIR spectroscopy, we analyse radiation-induced changes in ices containing H2O, CO, CO2, and CH3OH, molecules abundant in the Solar System and interstellar medium. Molecular degradation is quantified by apparent cross-sections that scale with the electronic stopping power (Se). Literature data reveal a power-law dependence, σd ∝ Sen, influenced by thickness, sputtering yield, and radiochemical effects. This empirical relationship serves as a benchmark for assessing molecular stability and the interplay between sputtering and radiolysis, improving models of chemical evolution in astrophysical ices.

AB - Ices in interstellar and planetary environments are constantly altered by cosmic radiation. Using FTIR spectroscopy, we analyse radiation-induced changes in ices containing H2O, CO, CO2, and CH3OH, molecules abundant in the Solar System and interstellar medium. Molecular degradation is quantified by apparent cross-sections that scale with the electronic stopping power (Se). Literature data reveal a power-law dependence, σd ∝ Sen, influenced by thickness, sputtering yield, and radiochemical effects. This empirical relationship serves as a benchmark for assessing molecular stability and the interplay between sputtering and radiolysis, improving models of chemical evolution in astrophysical ices.

KW - Astrochemistry

KW - Circumstellar clouds

KW - Methods: Laboratory ion irradiation

KW - Molecules

UR - https://www.scopus.com/pages/publications/105021260911

U2 - 10.1016/j.nimb.2025.165926

DO - 10.1016/j.nimb.2025.165926

M3 - Artículo

AN - SCOPUS:105021260911

SN - 0168-583X

VL - 570

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

M1 - 165926

ER -

de Barros ALF, Mejia C, Doreste DV, Domaracka A, Boduch P, Rothard H et al. Evaluation of the degradation cross-cection as stopping power dependence for pure and mixture molecular samples at cryogenic temperatures. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. 2026 Jan;570:165926. doi: 10.1016/j.nimb.2025.165926

Evaluation of the degradation cross-cection as stopping power dependence for pure and mixture molecular samples at cryogenic temperatures

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