Processing of N2O ice by fast ions: implications on nitrogen chemistry in cold astrophysical environments

Almeida, Guilherme C.; Pilling, S.; Barros, A. L. F. de; Costa, C. A. P. da; Pereira, Roberto; Silveira, E.F. da

doi:10.1093/mnras/stx1438

Cited by 23 publications

(10 citation statements)

References 46 publications

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“…Additionally, the desorption yield and molecular branching ratio at chemical equilibrium can be determined (e.g. Bonfim et al 2017, Almeida et al 2017Rachid et al 2017;Vasconcelos 2017a,b). Such chemical equilibrium occurs at a large radiation fluence and the composition of the sample, kept a constant temperature, stays constant even if the sample continues to be exposed to radiation.…”

Section: Experimental Methodologymentioning

confidence: 99%

“…More details about EBR of irradiated ices is given elsewhere (e.g. Almeida et al 2017;Rachid et al 2017).…”

Section: Cosmic-ray Induced Processes In Icesmentioning

confidence: 99%

“…Pilling et al 2009;Chen et al 2013;Pilling et al2011b;Pilling & Bergantini 2015;Jimenes-Escobar et al 2016;Vasconcelos et al 2017c;Bonfim et al 2016;Rachid et al2017;Almeida et al 2014; and references therein) and cosmic rays (e.g. Strazzulla et al 1983;Palumbo 2006;Strazzulla et al 2007;Seperuelo-Duarte et al 2009;Pilling et al 2010aPilling et al , 2010bHijazi et al 2011;Andrade et al 2013;Bergantini et al 2014a;de Barros et al 2014;Mejía et al 2014;Almeida et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Processing of astrophysical ices by soft X-rays and swift ions

Pilling

2017

Proc. IAU

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The employment of soft X-rays and swift ions has been used in laboratory to simulate the physicochemical processing of astrophysical ice analogs by energetic photons and cosmic rays. This processing includes excitation, ionization and molecular dissociation, desorption, as well as triggers the formation of new compounds. Here we present some results from experiments employing infrared spectroscopy in two different laboratories: LNLS/CNPEM in Campinas/Brazil and GANIL/CIRIL/CIMAP in Caen/France. Among the results are the formation of alkenes and aromatic compounds during the irradiation of saturated hydrocarbon-containing ices by cosmic ray analogs, the production of the nucleobase adenine during soft X-ray photolysis of N2:CH4 ice, as well as the formation of peptide bonds during the bombardment of frozen glycine by cosmic ray analogs. The interaction between cosmic ray analogs and ionizing soft X-rays probed in the laboratory allows us to identify reaction routes that lead to chemistry enhancement of astrophysical ices and help us put constrains in prebiotic chemistry.

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Section: Experimental Methodologymentioning

confidence: 99%

“…More details about EBR of irradiated ices is given elsewhere (e.g. Almeida et al 2017;Rachid et al 2017).…”

Section: Cosmic-ray Induced Processes In Icesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Processing of astrophysical ices by soft X-rays and swift ions

Pilling

2017

Proc. IAU

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“…Since both bands are very intense, they have been used for the NO2 and NO column density calculations, respectively. Formation of nitrogen oxides by radiolysis has been discussed recently (Almeida et al 2017). Table 3.…”

Section: No2 and Nomentioning

confidence: 99%

Chemical reactions in the nitrogen–acetone ice induced by cosmic ray analogues: relevance for the Solar system

Barros

Andrade

Silveira

et al. 2017

Monthly Notices of the Royal Astronomical Society

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b s e r v a t o r i o d o V a l o n go, Ladeira ABSTRACTThe radiolysis of a 10:1 nitrogen:acetone mixture, condensed at 11 K, by 40 MeV 58 Ni 11+ ions is studied. These results are representative of studies concerning solar system objects exposed to cosmic rays. In the Kuiper Belt, region of Trans-Neptunian Objects (TNOs), acetone, N2 and other small molecules were detected and may be present on icy surfaces. Bombardment by cosmic rays triggers chemical reactions leading to synthesis of larger molecules. In this work, destruction cross sections of acetone and nitrogen molecules in solid phase are determined from a sequence of infrared spectra obtained at increasing ion beam fluence. The results are analyzed and compared with those of previous experiments performed with pure acetone. It is observed that the N2 column density decreases very fast, suggesting that nitrogen quickly leaves a porous sample under irradiation. The behavior of acetone in the mixture confirms that the ice formed by deposition of the vapor mixture is more porous than that of pure acetone ice. The most abundant molecular species formed from the mixture during irradiation are: C3H6, C2H6, N3, CO, CH4 and CO2. Some N-bearing species are also formed, but with low production yield. Comparing with pure acetone results, it is seen that dissolving acetone in nitrogen a ffects the formation cross sections of the new species: CH4, CO2 and H2CO, for example, have formation cross section smaller than the respective values for irradiated pure acetone, while those for CO and C2H6 species are higher. This fact can explain the presence of C2H6 even in regions on Pluto where CH4 is not pure, but diluted in a N2 matrix together with less abundant species. These results also show the formation of more complex molecules, such as HNCO, acetic acid and, possibility, glycine. The production of these complex molecules suggests the formation of small prebiotic species in objects beyond Neptune from acetone diluted in a N 2 matrix irradiated by cosmic rays. Formation cross sections for the new formed species are determined.

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“…From a physical chemistry perspective, nitrogen exists both in reactive (e.g. N 2 O, NO − 3 [6,7,8,9,10,11,12,13], however, that energetic processing of N 2 -containing ices opens several channels for new chemical reactions, allowing the formation of N-reactive species. In addition, ⋅NO radicals have been considered an important precursor of prebiotic molecules, and therefore might be linked to the origin of life on earth as discussed in [14,15].…”

Section: Introductionmentioning

confidence: 99%

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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Processing of N2O ice by fast ions: implications on nitrogen chemistry in cold astrophysical environments

Cited by 23 publications

References 46 publications

Processing of astrophysical ices by soft X-rays and swift ions

Processing of astrophysical ices by soft X-rays and swift ions

Chemical reactions in the nitrogen–acetone ice induced by cosmic ray analogues: relevance for the Solar system

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

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