Sputtering of water ice

Baragiola, R. A.; Vidal, R.; Svendsen, Winnie Edith; Schou, Jørgen; Shi, Mude; Bahr, D. A.; Atteberrry, C.L.

doi:10.1016/s0168-583x(02)02052-9

Cited by 108 publications

(91 citation statements)

References 63 publications

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“…Sputtering (ejection) of molecules leads the erosion of a surface and it is the main agent that lead to decreases in the thickness of ices (e.g. Baragiola et al(2003)). The number of molecules ejected after ion impact (sputtering yield -Y, in molecules ion −1 ) was found to scale with the square of the electronic projectile energy loss (Seperuelo-Duarte et al2010;Dartois et al2015;Mejía et al2015).…”

Section: Thickness Calculationmentioning

confidence: 99%

Infrared complex refractive index of astrophysical ices exposed to cosmic rays simulated in the laboratory

Rocha

Pilling

Barros

et al. 2016

Mon. Not. R. Astron. Soc.

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In dense and cold regions of the interstellar medium (ISM), molecules may be adsorbed onto dust grains to form the ice mantles. Once formed, they can be processed by ionizing radiation coming from stellar or interstellar medium leading to formation of several new molecules in the ice. Among the different kind of ionizing radiation, cosmic rays play an important role in the solid-phase chemistry because of the large amount of energy deposited in the ices. The physicochemical changes induced by the energetic processing of astrophysical ices are recorded in a intrinsic parameter of the matter called complex refractive index (CRI). In this paper, we present for the first time a catalogue containing 39 complex refractive indices (n, k) in the infrared from 5000 and 600 cm

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Section: Thickness Calculationmentioning

confidence: 99%

Infrared complex refractive index of astrophysical ices exposed to cosmic rays simulated in the laboratory

Rocha

Pilling

Barros

et al. 2016

Mon. Not. R. Astron. Soc.

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“…It is well known that ion irradiation of pure solid H 2 O causes the formation of H 2 O 2 , H 2 , OH, and O 2 (e.g., Johnson 1990;Moore & Hudson 2000;Baragiola et al 2003;Gomis et al 2004), thus some blank experiments are necessary to verify that the results discussed above are due to a change in the morphology of water ice and do not depend on the presence of other species in the porous structure of solid water. As discussed above (see Table 1), the OH db feature shifts when other species are mixed in with water ice (e.g., Rowland et al 1991;Devlin et al 1992;Palumbo & Strazzulla 2003;Palumbo 2005).…”

Section: Blank Experimentsmentioning

confidence: 99%

Formation of compact solid water after ion irradiation at 15 K

Palumbo¹

2006

A&A

141

156

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We used infrared absorption spectroscopy to study the effects of ion irradiation on the morphology/porosity of amorphous water ice. Thin icy films (about 0.25 µm) of amorphous water were irradiated with 200 keV protons at 15 K. Both the behaviour of the OH dangling bond feature and the ability to trap carbon monoxide (CO) were used to investigate the evolution of icy samples after ion irradiation. We show that the intensity of the OH dangling bond feature decreases after ion irradiation and that the amount of absorbed carbon monoxide decreases as the fluence of impinging ions increases. The results obtained indicate that the porosity of amorphous water ice decreases after ion irradiation. Furthermore, icy mixtures such as H 2 O:CO 2 , H 2 O:CO, and H 2 O:CH 4 were irradiated with 200 keV H + , 30 and 200 keV He + ions. Also in these cases, the intensity of the OH dangling bond band decreases after ion irradiation. However, when a second molecular species is present in the ice sample, this decrease is slower. Here we present the experimental results and discuss their relevance to our understanding of the properties of interstellar water ice. In particular, we suggest that, because of cosmic ion bombardment, water ice in interstellar grain mantles is compact in structure.

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“…First, the large band-gap of solid CO makes the ionization channel energetically unavailable for Lyman-α photolysis, and previous experiments ) gave an extremely small cross section for CO 2 photosynthesis in CO ∼ 10 −20 cm 2 . Second, previous studies revealed that erosion yields from water ice by fast protons (Brown et al 1984) are much larger than by Lyman-α (Westley et al 1995a) due to a dominant double collision channel only available to ions, which is manifested in a quadratic dependence of the sputtering yield on electronic stopping power (S e ; Baragiola et al 2003). The erosion of CO is expected to be analogous since in this case the sputtering yield is also proportional to S 2 e (Brown et al 1984).…”

Section: Introductionmentioning

confidence: 99%

CO$\mathsf{_{2}}$ synthesis in solid CO by Lyman-α photons and 200 keV protons

Loeffler

Baratta²,

Palumbo³

et al. 2005

A&A

138

150

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Abstract.We have studied the synthesis of carbon dioxide from solid carbon monoxide at 16 K induced by photolysis with Lyman-α photons and by irradiation with 200 keV protons to quantitatively compare the effects of photolysis and ion irradiation on CO ice and to determine the importance of these processes in interstellar ice grains. The CO and CO 2 concentrations during irradiation of an initially pure CO film evolve with fluence to a saturation value, a behaviour that is explained by a two-state model. Our results indicate that the initial CO 2 production rates for both radiation processes are similar when normalized to the absorbed energy and that the solid CO 2 abundance observed in the interstellar ices cannot be explained only by radiolysis and photolysis of pure solid CO.

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Sputtering of water ice

Cited by 108 publications

References 63 publications

Infrared complex refractive index of astrophysical ices exposed to cosmic rays simulated in the laboratory

Infrared complex refractive index of astrophysical ices exposed to cosmic rays simulated in the laboratory

Formation of compact solid water after ion irradiation at 15 K

CO$\mathsf{_{2}}$ synthesis in solid CO by Lyman-α photons and 200 keV protons

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