Surface science investigations of the role of CO
            <sub>2</sub>
            in astrophysical ices

Edridge, J. L.; Freimann, Kati; Burke, Daren J.; Brown, Wendy A.

doi:10.1098/rsta.2011.0578

Cited by 31 publications

(44 citation statements)

References 58 publications

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“…5). This is consistent with the observation of a similar feature for CO 2 (Edridge et al 2013) as discussed later, and a coincident peak in the methanol TPD (Fig. 4).…”

Section: Resultssupporting

confidence: 80%

“…We then go on to study tertiary ices containing OCS, water and methanol. The experimental data show that methanol clearly influences the desorption of OCS, and we compare these results with data for CO 2 desorption from water and methanolcontaining ices also adsorbed on a carbonaceous surface (Edridge et al 2013). The experimental data are then incorporated into a simple model to simulate the modified desorption of OCS from the tertiary ices, when compared to binary ices, at astrophysical temperatures and time-scales.…”

Section: Introductionmentioning

confidence: 90%

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The effects of methanol on the trapping of volatile ice components

Burke

Brown

2015

Monthly Notices of the Royal Astronomical Society

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The evaporation of icy mantles, which have been formed on the surface of dust grains, is acknowledged to give rise to the rich chemistry that has been observed in the vicinity of hot cores and corinos. It has long been established that water ice is the dominant species within many astrophysical ices. However, other molecules found within astrophysical ices, particularly methanol, can influence the desorption of volatile species from the ice. Here we present a detailed investigation of the adsorption and desorption of methanol-containing ices, showing the effect that methanol has on the trapping and release of volatiles from model interstellar ices. OCS and CO 2 have been used as probe molecules since they have been suggested to reside in water-rich and methanol-rich environments. Experiments show that methanol fundamentally changes the desorption characteristics of both OCS and CO 2 , leading to the observation of mainly codesorption of both species with bulk water ice for the tertiary ices and causing a lowering of the temperature of the volcano component of the desorption. In contrast, binary ices are dominated by standard volcano desorption. This observation clearly shows that codepositing astrophysically relevant impurities with water ice, such as methanol, can alter the desorption dynamics of volatiles that become trapped in the pores of the amorphous water ice during the sublimation process. Incorporating experimental data into a simple model to simulate these processes on astrophysical timescales shows that the additional methanol component releases larger amounts of OCS from the ice mantle at lower temperatures and earlier times. These results are of interest to astronomers as they can be used to model the star formation process, hence giving information about the evolution of our Universe.

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“…5). This is consistent with the observation of a similar feature for CO 2 (Edridge et al 2013) as discussed later, and a coincident peak in the methanol TPD (Fig. 4).…”

Section: Resultssupporting

confidence: 80%

Section: Introductionmentioning

confidence: 90%

The effects of methanol on the trapping of volatile ice components

Burke

Brown

2015

Monthly Notices of the Royal Astronomical Society

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“…(Sandford & Allamandola 1990;Edridge et al 2013;Escribano et al 2013;Isokoski et al 2013;Gerakines & Hudson 2015); here we compare our results with some of the prior studies. In Isokoski et al (2013), Fig.…”

Section: Discussionsupporting

confidence: 65%

“…6 of Escribano et al (2013) the 200 ML of CO2 deposited at 14 K already shows some character of crystalline ice, and this also agrees with our results. In Edridge et al (2013)'s experiments, CO2 was deposited at 28 K, which is about the transition temperature from the amorphous phase. Their ν3 profiles show a sharp peak at all temperatures during TPD, indicating (poly)crystalline structure.…”

Section: Discussionmentioning

confidence: 99%

Characterization of thin film CO2 ice through the infrared ν1 + ν3 combination mode

He¹,

Vidali²

2017

Monthly Notices of the Royal Astronomical Society

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Carbon dioxide is abundant in ice mantles of dust grains; some is found in the pure crystalline form as inferred from the double peak splitting of the bending profile at about 650 cm −1 . To study how CO 2 segregates into the pure form from water-rich mixtures of ice mantles and how it then crystallizes, we used Reflection Absorption InfraRed Spectroscopy (RAIRS) to study the structural change of pure CO 2 ice as a function of both ice thickness and temperature. We found that the ν 1 + ν 3 combination mode absorption profile at 3708 cm −1 provides an excellent probe to quantify the degree of crystallinity in CO 2 ice. We also found that between 20 and 30 K, there is an ordering transition that we attribute to reorientation of CO 2 molecules, while the diffusion of CO 2 becomes significant at much higher temperatures. In the formation of pure crystalline CO 2 in ISM ices, the rate limiting process is the diffusion/segregation of CO 2 molecules in the ice instead of the phase transition from amorphous to crystalline after clusters/islands of CO 2 are formed.

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“…[1][2][3] On Earth, emissions of CO 2 into the atmosphere are rising, and there is a growing effort to develop carbon-capture and storage technologies (CO 2 sequestration) to mitigate global warming. As such there is much interest in the interaction of CO 2 with components of the environment including water and Earth abundant minerals.…”

Section: Introductionmentioning

confidence: 99%

A multi-technique study of CO2 adsorption on Fe3O4 magnetite

Pavelec

Hulva

Halwidl

et al. 2017

The Journal of Chemical Physics

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The adsorption of CO 2 on the Fe 3 O 4 (001)-( √ 2 × √ 2)R45 • surface was studied experimentally using temperature programmed desorption (TPD), photoelectron spectroscopies (UPS and XPS), and scanning tunneling microscopy. CO 2 binds most strongly at defects related to Fe 2+ , including antiphase domain boundaries in the surface reconstruction and above incorporated Fe interstitials. At higher coverages, CO 2 adsorbs at fivefold-coordinated Fe 3+ sites with a binding energy of 0.4 eV. Above a coverage of 4 molecules per (• unit cell, further adsorption results in a compression of the first monolayer up to a density approaching that of a CO 2 ice layer. Surprisingly, desorption of the second monolayer occurs at a lower temperature (≈84 K) than CO 2 multilayers (≈88 K), suggestive of a metastable phase or diffusion-limited island growth. The paper also discusses design considerations for a vacuum system optimized to study the surface chemistry of metal oxide single crystals, including the calibration and characterisation of a molecular beam source for quantitative TPD mea-

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Surface science investigations of the role of CO ₂ in astrophysical ices

Cited by 31 publications

References 58 publications

The effects of methanol on the trapping of volatile ice components

The effects of methanol on the trapping of volatile ice components

Characterization of thin film CO2 ice through the infrared ν1 + ν3 combination mode

A multi-technique study of CO2 adsorption on Fe3O4 magnetite

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Surface science investigations of the role of CO 2 in astrophysical ices

Cited by 31 publications

References 58 publications

The effects of methanol on the trapping of volatile ice components

The effects of methanol on the trapping of volatile ice components

Characterization of thin film CO2 ice through the infrared ν1 + ν3 combination mode

A multi-technique study of CO2 adsorption on Fe3O4 magnetite

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Surface science investigations of the role of CO ₂ in astrophysical ices