O2 signature in thin and thick O2−H2O ices

Müller, B.; Giuliano, B. M.; Bizzocchi, L.; Vasyunin, A. I.; Caselli, P.

doi:10.1051/0004-6361/201833549

Cited by 10 publications

(15 citation statements)

References 44 publications

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“…Other aspects relating polarity to astrophysical ices, have also been reported by Müller et al [41], associating the band strength of O 2 with the chemical environment. In addition, Knez et al [42], point out that the acetylene's 5 feature is much more resolved in ices dominated by non-polar or lowpolarity molecules.…”

Section: Astrophysical Implications 41 Polarity In Astrophysical Icessupporting

confidence: 64%

Infrared complex refractive index of N-containing astrophysical ices free of water processed by cosmic-ray simulated in laboratory

Rocha

Pilling

Domaracka

et al. 2020

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Several nitrogen containing species has been unambiguously identified in the Solar System and in the Interstellar Medium. It is believed that such rich inventory of species is a result of the energetic processing of astrophysical ices during all stages of the protostellar evolution. An intrinsic parameter of matter, the complex refractive index, stores all the "chemical memory" triggered by energetic processing, and therefore might be used to probe ice observations in the infrared. In this study, four N-containing ices have been condensed in ultra-high vacuum chamber and processed by heavy ions (O and Ni) with energies between 0.2 and 15.7 MeV at the Grand Accélérateur National d'Ions Lourds (GANIL), in Caen, France. All chemical changes were monitored in situ by a Infrared Absorption Spectroscopy. The complex refractive index was calculated directly from the absorbance spectrum, by using the Lambert-Beer and Kramers-Kroning relations. The values containing the values will be available in a online database: https://www1.univap.br/gaa/nkabs-database/data.htm. As result, other than the database, it was observed that non-polar ices are more destroyed by sputtering than polar ones. Such destruction and chemical evolution leads to variation in the IR albedo of samples addressed in this paper.

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Section: Astrophysical Implications 41 Polarity In Astrophysical Icessupporting

confidence: 64%

Infrared complex refractive index of N-containing astrophysical ices free of water processed by cosmic-ray simulated in laboratory

Rocha

Pilling

Domaracka

et al. 2020

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…The set-up is composed of a closed-cycle He cryostat purchased from Advanced Research Systems, coupled with a Bruker Fourier Transform Infrared (FTIR) spectrometer. A detailed description of the set-up can be found in Müller et al (2018).…”

Section: Experimental Methodsmentioning

confidence: 99%

Spectroscopic measurements of CH₃OH in layered and mixed interstellar ice analogues

Müller

Giuliano

Goto

et al. 2021

A&A

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Context. The molecular composition of interstellar ice mantles is defined by gas-grain processes in molecular clouds, with the main components being H2O, CO, and CO2. Methanol (CH3OH) ice is detected towards the denser pre-stellar cores and star-forming regions, where large amounts of CO molecules freeze out and get hydrogenated on top of the icy grains. The thermal heating from nearby protostars can further change the ice structure and composition. Despite the several observations of icy features carried out towards molecular clouds and along the line of site of protostars, it is not yet clear if interstellar ices are mixed or if they have a layered structure. Aims. We aim to examine the effect of mixed and layered ice growth in dust grain mantle analogues, with specific focus on the position and shape of methanol infrared bands, so dedicated future observations could shed light on the structure of interstellar ices in different environments. Methods. Mixed and layered ice samples were deposited on a cold substrate kept at a temperature of 10 K using a closed-cycle cryostat placed in a vacuum chamber. The spectroscopic features were analysed by Fourier transform infrared spectroscopy. Different proportions of the most abundant four molecular species in ice mantles, namely H2O, CO, CO2, and CH3OH, were investigated, with a special attention placed on the analysis of the CH3OH bands. Results. We measure changes in the position and shape of the CH and CO stretching bands of CH3OH depending on the mixed or layered nature of the ice sample. Spectroscopic features of methanol are also found to change due to heating. Conclusions. A layered ice structure best reproduces the CH3OH band position recently observed towards a pre-stellar core and in star-forming regions. Based on our experimental results, we conclude that observations of CH3OH ice features in space can provide information about the structure of interstellar ices, and we expect the James Webb Space Telescope to put stringent constraints on the layered or mixed nature of ices in different interstellar environments, from molecular clouds to pre-stellar cores to protostars and protoplanetary discs.

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“…The local number densities in the coma of 67P vary spatially and temporally for different compounds (Hassig et al 2015;Luspay-Kuti et al 2015) and their relations to the comet structure and composition are not yet clear. The presence of O2 in cometary and interstellar ices can alter the spectral properties of other ice components (Ehrenfreund et al 1997;Muller et al 2018) and their binding energies as it was demonstrated for O2:CO ice mixtures (Acharyya et al 2007). Thus, the presence of O2 in ice can have an influence on the amount of species released to the gas phase in interstellar and circumstellar environments.…”

Section: Atom Bombardmentmentioning

confidence: 99%

Photodesorption of Water Ice from Dust Grains and Thermal Desorption of Cometary Ices Studied by the INSIDE Experiment

Потапов

Jäger

Henning

2019

ApJ

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A new experimental set-up INterStellar Ice-Dust Experiment (INSIDE), was designed for studying cosmic grain analogues represented by ice-coated carbon-and silicate-based dust grains. In the new instrument, we can simulate physical and chemical conditions prevailing in interstellar and circumstellar environments. The set-up combines ultrahigh vacuum and low temperature conditions with infrared spectroscopy and mass spectrometry. Using INSIDE, we plan to investigate physical and chemical processes, such as adsorption, desorption, and formation of molecules, on the surface of dust/ice samples. First experiments on the photodesorption of water ice molecules from the surface of silicate and carbon grains by UV photons revealed a strong influence of the surface properties on the desorption yield, in particular in the monolayer regime. In the second experiment, the thermal desorption of cometary ice analogues composed of six molecular components was studied for the first time.Co-desorption of CO2 and CH3OH with O2 indicates that at high O2 concentrations in cometary or interstellar ices "heavy" ice molecules can be partly trapped in O2 and release to the gas phase much earlier than expected. This effect could explain astronomical detections of complex organic molecules in cold dense interstellar clouds.

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O₂ signature in thin and thick O₂−H₂O ices

Cited by 10 publications

References 44 publications

Infrared complex refractive index of N-containing astrophysical ices free of water processed by cosmic-ray simulated in laboratory

Infrared complex refractive index of N-containing astrophysical ices free of water processed by cosmic-ray simulated in laboratory

Spectroscopic measurements of CH₃OH in layered and mixed interstellar ice analogues

Photodesorption of Water Ice from Dust Grains and Thermal Desorption of Cometary Ices Studied by the INSIDE Experiment

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O2 signature in thin and thick O2−H2O ices

Cited by 10 publications

References 44 publications

Infrared complex refractive index of N-containing astrophysical ices free of water processed by cosmic-ray simulated in laboratory

Infrared complex refractive index of N-containing astrophysical ices free of water processed by cosmic-ray simulated in laboratory

Spectroscopic measurements of CH3OH in layered and mixed interstellar ice analogues

Photodesorption of Water Ice from Dust Grains and Thermal Desorption of Cometary Ices Studied by the INSIDE Experiment

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Product

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O₂ signature in thin and thick O₂−H₂O ices

Spectroscopic measurements of CH₃OH in layered and mixed interstellar ice analogues