The irradiation of pure CH3OH and 1:1 mixture of NH3:CH3OH ices at 30K using low energy electrons

Jheeta, Sohan; Domaracka, A.; Ptasińska, Sylwia; Sivaraman, Bhalamurugan; Mason, N.J.

doi:10.1016/j.cplett.2012.11.074

Cited by 37 publications

(41 citation statements)

References 28 publications

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“…As stated previously, we could only detect ammonia and urea in the electrolyte. Any other possible products, such as hydrazin and/or formamide, could not be found after careful analysis for these substances by hydroxamate methods [40].…”

Section: Mechanismmentioning

confidence: 99%

Simultaneous electrocatalytic reduction of dinitrogen and carbon dioxide on conducting polymer electrodes

Kayan

Köleli

2016

Applied Catalysis B: Environmental

110

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Section: Mechanismmentioning

confidence: 99%

Simultaneous electrocatalytic reduction of dinitrogen and carbon dioxide on conducting polymer electrodes

Kayan

Köleli

2016

Applied Catalysis B: Environmental

110

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“…Laboratory studies show that in this case COMs are efficiently formed through recombination of carbon-bearing CH 3 OH dissociation products (Allamandola et al 1988;Hudson & Moore 2000;Öberg et al 2009;Modica & Palumbo 2010;Jheeta et al 2013;Henderson & Gudipati 2015;Maity et al 2015;Abou Mrad et al 2016;Paardekooper et al 2016a;Chuang et al 2017). Whereas the "nonenergetic" scenarios are thought to dominate in dark clouds, the latter ones will be more prominent during later stages of the star and planet formation process.…”

Section: Introductionmentioning

confidence: 99%

Formation of Glycerol through Hydrogenation of CO Ice under Prestellar Core Conditions

Fedoseev

Chuang

Ioppolo

et al. 2017

ApJ

100

111

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Observational studies reveal that complex organic molecules (COMs) can be found in various objects associated with different star formation stages. The identification of COMs in prestellar cores, i.e., cold environments in which thermally induced chemistry can be excluded and radiolysis is limited by cosmic rays and cosmic-rayinduced UV photons, is particularly important as this stage sets up the initial chemical composition from which ultimately stars and planets evolve. Recent laboratory results demonstrate that molecules as complex as glycolaldehyde and ethylene glycol are efficiently formed on icy dust grains via nonenergetic atom addition reactions between accreting H atoms and CO molecules, a process that dominates surface chemistry during the "CO freeze-out stage" in dense cores. In the present study we demonstrate that a similar mechanism results in the formation of the biologically relevant molecule glycerol-HOCH 2 CH(OH)CH 2 OH-a three-carbon-bearing sugar alcohol necessary for the formation of membranes of modern living cells and organelles. Our experimental results are fully consistent with a suggested reaction scheme in which glycerol is formed along a chain of radical-radical and radical-molecule interactions between various reactive intermediates produced upon hydrogenation of CO ice or its hydrogenation products. The tentative identification of the chemically related simple sugar glyceraldehyde-HOCH 2 CH(OH)CHO-is discussed as well. These new laboratory findings indicate that the proposed reaction mechanism holds much potential to form even more complex sugar alcohols and simple sugars.

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“…The study of the molecules in binary mixtures may give clearer results in terms of the new species (e.g. Jheeta et al 2013;D'Hendecourt et al 1985Muñoz Caro & Schutte 2003;Bernstein et al 1995), but it may not be a realistic representation of the physicochemical processes that occur in complex ice bodies such as Enceladus.…”

Section: Discussionmentioning

confidence: 99%

“…CH 2 OH was detected by Gerakines et al (1996) through UV irradiation of pure methanol (CH 3 OH), and by Jheeta et al (2013) through electron irradiation of a methanol-containing ice. In both cases, the CH 2 OH band was identified in the 1352 cm −1 (7.39 μm) region, the same position as in this work.…”

Section: Ice Processing By 1 Kev Electronsmentioning

confidence: 99%

Processing of analogues of plume fallout in cold regions of Enceladus by energetic electrons

Bergantini

Pilling

Nair

et al. 2014

A&A

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Context. Enceladus, a small icy moon of Saturn, is one of the most remarkable bodies in the solar system. This moon is a geologically active object, and despite the lower temperatures on most of its surface, the geothermally heated south polar region presents geysers that spouts a plume made of water (∼90%), carbon dioxide, methane, ammonia, and methanol, among other molecules. Most of the upward-moving particles do not have the velocity to escape from the gravitational influence of the moon and fall back to the surface. The molecules in the ice are continuously exposed to ionizing radiation, such as UV and X-rays photons, cosmic rays, and electrons. Over time, the ionizing radiation promotes molecular bond rupture, destroying and also forming molecules, radicals, and fragments. Aims. We analyse the processing of an ice mixture analogue to the Enceladus fallout ice in cold resurfaced areas (north pole) by 1 keV electrons. The main goal is to search for complex species that have not yet been detected in this moon, and to determine relevant physico-chemical parameters, such as destruction and formation cross-sections and the half-life of the studied molecules in the ice. Methods. The experiment consisted of the electron irradiation of an Enceladus-like ice mixture (H 2 O:CO 2 :CH 4 :NH 3 :CH 3 OH) in an ultra-high vacuum chamber at 20 K. The analysis was made by infrared spectrometry in the mid-infrared region (4000−800 cm −1 or 2.5−12.5 μm). Results. The absolute dissociation cross-sections of the parent molecules, the formation cross-section of daughter species, and the half-life of the parental species in a simulated Enceladus irradiation scenario were determined. Among the produced species, CO (carbon monoxide), OCN − (cyanate anion), HCONH 2 (formamide), and H 2 CO (formaldehyde) were tentatively detected.

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The irradiation of pure CH3OH and 1:1 mixture of NH3:CH3OH ices at 30K using low energy electrons

Cited by 37 publications

References 28 publications

Simultaneous electrocatalytic reduction of dinitrogen and carbon dioxide on conducting polymer electrodes

Simultaneous electrocatalytic reduction of dinitrogen and carbon dioxide on conducting polymer electrodes

Formation of Glycerol through Hydrogenation of CO Ice under Prestellar Core Conditions

Processing of analogues of plume fallout in cold regions of Enceladus by energetic electrons

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