Thermal desorption of carbon monoxide from model interstellar ice surfaces: revealing surface heterogeneity

Taj, Skandar; McCoustra, Martin R. S.

doi:10.1093/mnras/staa2372

Cited by 4 publications

(4 citation statements)

References 26 publications

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“…This was deliberately done to ensure that there are pure volatile and supervolatile ice domains in the mixed molecular ices. This method differs slightly from previous methods [Malyk et al 2007;Martin-Domenech et al 2014], where either observed mixing ratios were used for mixed molecular ices or layered ices [Acharyya et al 2007;Bar-Nun et al 2013;Collings et al 2004;Collings et al 2003;Collings et al 2005;Edridge et al 2013;Fayolle et al 2011;Fraser et al 2004;Fuchs et al 2006;Greenberg et al 2017;Muller et al 2018;Rawlings et al 2006;Taj and McCoustra 2020], or pure ices were studied through TPD [Isokoski et al 2014;Mate et al 2008]. In astrophysical environments it is unlikely that pure supervolatile ice grains exist where no other molecule is present in the ice grains, such as pure CO ice, though pure CO ice domains could exist in an ice grain that contains other volatiles as well.…”

Section: Tpd Of Mixed Molecular Icesmentioning

confidence: 99%

“…ensure that there are pure volatile and supervolatile ice domains in the mixed molecular ices. This method differs slightly from previous methods, 19,20 where either observed mixing ratios were used for mixed molecular ices or layered ices, [21][22][23][24][25][26][27][28][29][30][31][32][33] or pure ices were studied through TPD. 34,35 In astrophysical environments it is unlikely that pure supervolatile ice grains exist where no other molecule is present in the ice grains, such as pure CO ice, though pure CO ice domains could exist in an ice grain that contains other volatiles as well.…”

Section: Tpd Of Mixed Molecular Icesmentioning

confidence: 99%

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Thermal behavior of astrophysical amorphous molecular ices

et al. 2023

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Section: Tpd Of Mixed Molecular Icesmentioning

confidence: 99%

Section: Tpd Of Mixed Molecular Icesmentioning

confidence: 99%

Thermal behavior of astrophysical amorphous molecular ices

et al. 2023

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“…coming to the fore with studies likewise on a variety of carbonaceous [168], siliceous [167,198,199] and ice surfaces [168,198,200]. As an illustrative example, we consider the study of CO desorption from amorphous silica by Taj and co-workers [198,199].…”

Section: Thermal Processesmentioning

confidence: 99%

Physics and chemistry on the surface of cosmic dust grains: a laboratory view

Потапов

McCoustra

2021

International Reviews in Physical Chemistry

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Dust grains play a central role in the physics and chemistry of cosmic environments. They influence the optical and thermal properties of the medium due to their interaction with stellar radiation; provide surfaces for the chemical reactions that are responsible for the synthesis of a significant fraction of key astronomical molecules; and they are building blocks of pebbles, comets, asteroids, planetesimals, and planets. In this paper, we review experimental studies of physical and chemical processes, such as adsorption, desorption, diffusion, and reactions forming molecules, on the surface of reliable cosmic dust grain analogues as related to processes in diffuse, translucent, and dense interstellar clouds, protostellar envelopes, planetforming disks, and planetary atmospheres. The information that such experiments reveal should be flexible enough to be used in many different environments. In addition, we provide a forward look discussing new ideas, experimental approaches, and research directions.

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“…However, setting up the physicochemical conditions of the IS medium realistically is technically very difficult, and reproducing the actual composition of grain analogues (e.g., dirty ice mantles) is also tricky [61]. Additionally, information derived from the experiments (e.g., activation and diffusion energies) is dependent on the physico-chemical model adopted to interpret the results, as in the temperature programmed desorption (TPD) experiments [62].…”

Section: Introductionmentioning

confidence: 99%

Computational Surface Modelling of Ices and Minerals of Interstellar Interest—Insights and Perspectives

et al. 2020

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The universe is molecularly rich, comprising from the simplest molecule (H2) to complex organic molecules (e.g., CH3CHO and NH2CHO), some of which of biological relevance (e.g., amino acids). This chemical richness is intimately linked to the different physical phases forming Solar-like planetary systems, in which at each phase, molecules of increasing complexity form. Interestingly, synthesis of some of these compounds only takes place in the presence of interstellar (IS) grains, i.e., solid-state sub-micron sized particles consisting of naked dust of silicates or carbonaceous materials that can be covered by water-dominated ice mantles. Surfaces of IS grains exhibit particular characteristics that allow the occurrence of pivotal chemical reactions, such as the presence of binding/catalytic sites and the capability to dissipate energy excesses through the grain phonons. The present know-how on the physicochemical features of IS grains has been obtained by the fruitful synergy of astronomical observational with astrochemical modelling and laboratory experiments. However, current limitations of these disciplines prevent us from having a full understanding of the IS grain surface chemistry as they cannot provide fundamental atomic-scale of grain surface elementary steps (i.e., adsorption, diffusion, reaction and desorption). This essential information can be obtained by means of simulations based on computational chemistry methods. One capability of these simulations deals with the construction of atom-based structural models mimicking the surfaces of IS grains, the very first step to investigate on the grain surface chemistry. This perspective aims to present the current state-of-the-art methods, techniques and strategies available in computational chemistry to model (i.e., construct and simulate) surfaces present in IS grains. Although we focus on water ice mantles and olivinic silicates as IS test case materials to exemplify the modelling procedures, a final discussion on the applicability of these approaches to simulate surfaces of other cosmic grain materials (e.g., cometary and meteoritic) is given.

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Thermal desorption of carbon monoxide from model interstellar ice surfaces: revealing surface heterogeneity

Cited by 4 publications

References 26 publications

Thermal behavior of astrophysical amorphous molecular ices

Thermal behavior of astrophysical amorphous molecular ices

Physics and chemistry on the surface of cosmic dust grains: a laboratory view

Computational Surface Modelling of Ices and Minerals of Interstellar Interest—Insights and Perspectives

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