ION IRRADIATION OF H<sub>2</sub>-LADEN POROUS WATER-ICE FILMS: IMPLICATIONS FOR INTERSTELLAR ICES

Raut, U.; Mitchell, E. H.; Baragiola, R. A.

doi:10.1088/0004-637x/811/2/120

ApJ

2015

DOI: 10.1088/0004-637x/811/2/120

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ION IRRADIATION OF H₂-LADEN POROUS WATER-ICE FILMS: IMPLICATIONS FOR INTERSTELLAR ICES

U. Raut

E. H. Mitchell

R. A. Baragiola

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Cited by 3 publications

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“…8,9,12,13 We collected IR spectra of 1100-ML-thick ASW films deposited onto a CsI substrate at h ¼ 0 for different T g in a second UHV system. 29,33 Spectra were taken with 2 cm À1 resolution in the transmission mode using a Nicolet 670 Fourier transform infrared spectrometer and expressed in optical depth, Àln(T/T o ), where T is the transmission of the film-CsI system, and T o is that through the bare CsI substrate. The substrate material does not affect the IR features of DBs of the ice films.…”

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confidence: 99%

Spontaneous cracking of amorphous solid water films and the dependence on microporous structure

Dukes

Baragiola

2016

Applied Physics Letters

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Vapor-deposited, porous, amorphous, water-ice films, also called amorphous solid water (ASW), crack spontaneously during growth when the film thickness exceeds a critical value (Lc). We measured the Lc during growth of ASW films as a function of growth temperature (Tg = 10 K, 30 K, and 50 K) and deposition angle (θ = 0°, 45°, and 55°) using a quartz crystal microbalance, an optical interferometer, and an infrared spectrometer. The critical thickness, 1–5 μm under our experimental conditions, increases with Tg and θ, an indication of film porosity. We suggest that ASW films undergo tensile stress due to the mismatch between substrate adhesion and contracting forces derived from the incompletely coordinated molecules on the surfaces of the pores. We provide a model to explain the observed dependences of Lc on the Tg and θ in the context of Griffith theory and estimate the tensile strength of low-temperature ASW to be ∼25–40 MPa. Our model can be applied more generally to describe fracture of other solids with microporous structures, such as metallic or ceramic materials with voids.

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Spontaneous cracking of amorphous solid water films and the dependence on microporous structure

Dukes

Baragiola

2016

Applied Physics Letters

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Photochemistry and Astrochemistry: Photochemical Pathways to Interstellar Complex Organic Molecules

2016

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The interstellar medium is characterized by a rich and diverse chemistry. Many of its complex organic molecules are proposed to form through radical chemistry in icy grain mantles.Radicals form readily when interstellar ices (composed of water and other volatiles) are exposed to UV photons and other sources of dissociative radiation, and if sufficiently mobile the radicals can react to form larger, more complex molecules. The resulting complex organic molecules (COMs) accompany star and planet formation, and may eventually seed the origins of life on nascent planets. Experiments of increasing sophistication have demonstrated that known interstellar COMs as well as the prebiotically interesting amino acids can form through ice photochemistry. We review these experiments and discuss the qualitative and quantitative kinetic and mechanistic constraints they have provided. We finally compare the effects of UV radiation with those of three other potential sources of radical production and chemistry in interstellar ices: electrons, ions and X-rays.

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Accelerating ‘Oumuamua with H2 is challenging

Ligterink

2023

Nature

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ION IRRADIATION OF H₂-LADEN POROUS WATER-ICE FILMS: IMPLICATIONS FOR INTERSTELLAR ICES

Cited by 3 publications

References 39 publications

Spontaneous cracking of amorphous solid water films and the dependence on microporous structure

Spontaneous cracking of amorphous solid water films and the dependence on microporous structure

Photochemistry and Astrochemistry: Photochemical Pathways to Interstellar Complex Organic Molecules

Accelerating ‘Oumuamua with H2 is challenging

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ION IRRADIATION OF H2-LADEN POROUS WATER-ICE FILMS: IMPLICATIONS FOR INTERSTELLAR ICES

Cited by 3 publications

References 39 publications

Spontaneous cracking of amorphous solid water films and the dependence on microporous structure

Spontaneous cracking of amorphous solid water films and the dependence on microporous structure

Photochemistry and Astrochemistry: Photochemical Pathways to Interstellar Complex Organic Molecules

Accelerating ‘Oumuamua with H2 is challenging

Contact Info

Product

Resources

About

ION IRRADIATION OF H₂-LADEN POROUS WATER-ICE FILMS: IMPLICATIONS FOR INTERSTELLAR ICES