Thermally induced mixing of water dominated interstellar ices

Burke, Daren J.; Wolff, Angela J.; Edridge, J. L.; Brown, Wendy A.

doi:10.1039/b807220e

Cited by 9 publications

(22 citation statements)

References 64 publications

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“…However, it is enough to inhibit the restructuring of the methyl formate film. Similar effects have been observed for ethanol/ASW layered ices adsorbed on HOPG at 98 K. 26 Our assignment of the C= =O spectral shift to thermally induced mixing is at odds with Bertin et al, who ascribed a similar red-shift to a structural change in the methyl formate film. 6 Clearly, our pure methyl formate and layered ices do not show the same RAIR spectra following annealing to 110 K. The differences between our spectra and those of Bertin could arise from the different temperatures at which the water ices are grown in the two studies.…”

Section: Rairssupporting

confidence: 81%

“…23,47 However, molecules that exhibit hydrogen bonding, such as methanol or ethanol, can directly affect the water ice. First, the water TPD desorption profile may be modified by the presence of a guest molecule in the water matrix, as observed for methanol, 25 ethanol, 26 and glycine. 48,49 Second, the crystallization of ASW may also be modified by interactions of an impurity, e.g., methanol, which lowers the temperature of the onset of crystallization 27 and hence modifies the desorption of trapped molecules.…”

Section: Isomer Effects On Water Desorption and Crystallizationmentioning

confidence: 99%

“…Dimethyl ether, acetone, ethanol, 26 and propan-2-ol 54 were chosen because of their astrophysical relevance. In all cases, the desorption of these species was recorded both on and in water ice.…”

Section: Our Complex Intermediate Classification Extends That Of Collmentioning

confidence: 99%

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Trapping and desorption of complex organic molecules in water at 20 K

Burke

Puletti

Woods

et al. 2015

The Journal of Chemical Physics

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Laser desorption time-of-flight mass spectrometry of ultraviolet photo-processed ices Rev. Sci. Instrum. 85, 104501 (2014); 10.1063/1.4896754The release of trapped gases from amorphous solid water films. II. "Bottom-up" induced desorption pathways J. Chem. Phys. 138, 104502 (2013) The formation, chemical, and thermal processing of complex organic molecules (COMs) is currently a topic of much interest in interstellar chemistry. The isomers glycolaldehyde, methyl formate, and acetic acid are particularly important because of their role as pre-biotic species. It is becoming increasingly clear that many COMs are formed within interstellar ices which are dominated by water. Hence, the interaction of these species with water ice is crucially important in dictating their behaviour. Here, we present the first detailed comparative study of the adsorption and thermal processing of glycolaldehyde, methyl formate, and acetic acid adsorbed on and in water ices at astrophysically relevant temperatures (20 K). We show that the functional group of the isomer dictates the strength of interaction with water ice, and hence the resulting desorption and trapping behaviour. Furthermore, the strength of this interaction directly affects the crystallization of water, which in turn affects the desorption behaviour. Our detailed coverage and composition dependent data allow us to categorize the desorption behaviour of the three isomers on the basis of the strength of intermolecular and intramolecular interactions, as well as the natural sublimation temperature of the molecule. This categorization is extended to other C, H, and O containing molecules in order to predict and describe the desorption behaviour of COMs from interstellar ices. C 2015 AIP Publishing LLC.[http://dx

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Section: Rairssupporting

confidence: 81%

Section: Isomer Effects On Water Desorption and Crystallizationmentioning

confidence: 99%

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Trapping and desorption of complex organic molecules in water at 20 K

Burke

Puletti

Woods

et al. 2015

The Journal of Chemical Physics

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“…Assignment of the CO 2 desorption features seen in figure 3a can be made by comparison with the TPD spectra of pure CO 2 (figure 1), with previous studies of layered CO 2 /H 2 O ices [32,38,47,50] and with studies of layered ices containing other volatiles adsorbed on ASW [50,60,61]. The broad, low-temperature, CO 2 TPD peak seen in figure 3a can be assigned to the desorption of pure CO 2 from the surface of the ASW.…”

Section: Resultsmentioning

confidence: 63%

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

Edridge

Freimann

Burke

et al. 2013

Phil. Trans. R. Soc. A.

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We have recorded reflection–absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption (TPD) data for a range of CO 2 -bearing model astrophysical ices adsorbed on a graphitic dust grain analogue surface. Data have been recorded for pure CO 2 , for CO 2 adsorbed on top of amorphous solid water, for mixed CO 2 :H 2 O ices and for CO 2 adsorbed on top of a mixed CH 3 OH:H 2 O ice. For the TPD data, kinetic parameters for desorption have been determined, and the trapping behaviour of the CO 2 in the H 2 O (CH 3 OH) ice has been determined. Data of these types are important as they can be used to model desorption in a range of astrophysical environments. RAIR spectra have also shown the interaction of the CO 2 with H 2 O and CH 3 OH and can be used to compare with astronomical observations, allowing the accurate assignment of spectra.

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“…The properties, surface structure, and reactions of ice have been studied in significant detail because of their importance to several chemical and physical processes that occur at low temperatures (90,91), as well as their catalytic role in polar stratospheric clouds in the depletion of the ozone layer (1)(2)(3)92) and their relevance in chemistry in the interstellar medium (25,(93)(94)(95). Ice surfaces prepared at low temperatures offer a unique environment in which to investigate various chemical and physical processes, such as diffusion (21), cluster formation (40,41), phase transition (96,97), chemical reaction, hydrogen/deuterium exchange (98)(99)(100)(101)(102)(103)(104)(105)(106), interactions with small molecules (46), and adsorption (26,30).…”

Section: Wwwannualreviewsorg • Probing Molecular Solids With Low-enmentioning

confidence: 99%

Probing Molecular Solids with Low-Energy Ions

Bag

Bhuin

Natarajan

et al. 2013

Annual Rev. Anal. Chem.

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Ion/surface collisions in the ultralow-to low-energy (1-100-eV) window represent an excellent technique for investigation of the properties of condensed molecular solids at low temperatures. For example, this technique has revealed the unique physical and chemical processes that occur on the surface of ice, versus the liquid and vapor phases of water. Such instrumentdependent research, which is usually performed with spectroscopy and mass spectrometry, has led to new directions in studies of molecular materials. In this review, we discuss some interesting results and highlight recent developments in the area. We hope that access to the study of molecular solids with extreme surface specificity, as described here, will encourage investigators to explore new areas of research, some of which are outlined in this review.

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Thermally induced mixing of water dominated interstellar ices

Cited by 9 publications

References 64 publications

Trapping and desorption of complex organic molecules in water at 20 K

Trapping and desorption of complex organic molecules in water at 20 K

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

Probing Molecular Solids with Low-Energy Ions

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Thermally induced mixing of water dominated interstellar ices

Cited by 9 publications

References 64 publications

Trapping and desorption of complex organic molecules in water at 20 K

Trapping and desorption of complex organic molecules in water at 20 K

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

Probing Molecular Solids with Low-Energy Ions

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Product

Resources

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