Relevant bibliographies by topics / Interstellar Medium - Radical‐Molecule Reactions

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Interstellar Medium - Radical‐Molecule Reactions'

Author: Grafiati
Published: 7 September 2023

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Journal articles on the topic "Interstellar Medium - Radical‐Molecule Reactions"

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Brigiano, Flavio Siro, Yannick Jeanvoine, Antonio Largo, and Riccardo Spezia. "The formation of urea in space." Astronomy & Astrophysics 610 (February 2018): A26. http://dx.doi.org/10.1051/0004-6361/201731610.

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Context. Many organic molecules have been observed in the interstellar medium thanks to advances in radioastronomy, and very recently the presence of urea was also suggested. While those molecules were observed, it is not clear what the mechanisms responsible to their formation are. In fact, if gas-phase reactions are responsible, they should occur through barrierless mechanisms (or with very low barriers). In the past, mechanisms for the formation of different organic molecules were studied, providing only in a few cases energetic conditions favorable to a synthesis at very low temperature. A
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West, Niclas A., Edward Rutter, Mark A. Blitz, Leen Decin, and Dwayne E. Heard. "Low temperature gas phase reaction rate coefficient measurements: Toward modeling of stellar winds and the interstellar medium." Proceedings of the International Astronomical Union 15, S350 (2019): 382–83. http://dx.doi.org/10.1017/s1743921319007531.

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AbstractStellar winds of Asymptotic Giant Branch (AGB) stars are responsible for the production of ∼85% of the gas molecules in the interstellar medium (ISM), and yet very few of the gas phase rate coefficients under the relevant conditions (10 – 3000 K) needed to model the rate of production and loss of these molecules in stellar winds have been experimentally measured. If measured at all, the value of the rate coefficient has often only been obtained at room temperature, with extrapolation to lower and higher temperatures using the Arrhenius equation. However, non-Arrhenius behavior has been
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Parker, Dorian S. N., Ralf I. Kaiser, Oleg Kostko, et al. "On the formation of pyridine in the interstellar medium." Physical Chemistry Chemical Physics 17, no. 47 (2015): 32000–32008. http://dx.doi.org/10.1039/c5cp02960k.

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The nitrogen bearing aromatic molecule pyridine (C<sub>5</sub>H<sub>5</sub>N) is revealed to form in high temperature environments simulating conditions in carbon-rich circumstellar envelopes via the reaction of the cyano vinyl radical with vinyl cyanide.
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Canosa, André. "Gas phase reaction kinetics of complex organic molecules at temperatures of the interstellar medium: The OH + CH3OH case." Proceedings of the International Astronomical Union 15, S350 (2019): 35–40. http://dx.doi.org/10.1017/s1743921319006446.

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AbstractRecent experimental and theoretical works concerning gas-phase radical-neutral reactions involving Complex Organic Molecules are reviewed in the context of cold interstellar objects with a special emphasis on the OH + CH3OH reaction and its potential impact on the formation of CH3O.
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Miksch, April M., Annalena Riffelt, Ricardo Oliveira, Johannes Kästner, and Germán Molpeceres. "Hydrogenation of small aromatic heterocycles at low temperatures." Monthly Notices of the Royal Astronomical Society 505, no. 3 (2021): 3157–64. http://dx.doi.org/10.1093/mnras/stab1514.

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ABSTRACT The recent wave of detections of interstellar aromatic molecules has sparked interest in the chemical behaviour of aromatic molecules under astrophysical conditions. In most cases, these detections have been made through chemically related molecules, called proxies, that implicitly indicate the presence of a parent molecule. In this study, we present the results of the theoretical evaluation of the hydrogenation reactions of different aromatic molecules (benzene, pyridine, pyrrole, furan, thiophene, silabenzene, and phosphorine). The viability of these reactions allows us to evaluate
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Doddipatla, Srinivas, Galiya R. Galimova, Hongji Wei, et al. "Low-temperature gas-phase formation of indene in the interstellar medium." Science Advances 7, no. 1 (2021): eabd4044. http://dx.doi.org/10.1126/sciadv.abd4044.

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Polycyclic aromatic hydrocarbons (PAHs) are fundamental molecular building blocks of fullerenes and carbonaceous nanostructures in the interstellar medium and in combustion systems. However, an understanding of the formation of aromatic molecules carrying five-membered rings—the essential building block of nonplanar PAHs—is still in its infancy. Exploiting crossed molecular beam experiments augmented by electronic structure calculations and astrochemical modeling, we reveal an unusual pathway leading to the formation of indene (C9H8)—the prototype aromatic molecule with a five-membered ring—vi
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Zaverkin, V., T. Lamberts, M. N. Markmeyer, and J. Kästner. "Tunnelling dominates the reactions of hydrogen atoms with unsaturated alcohols and aldehydes in the dense medium." Astronomy & Astrophysics 617 (September 2018): A25. http://dx.doi.org/10.1051/0004-6361/201833346.

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Hydrogen addition and abstraction reactions play an important role as surface reactions in the buildup of complex organic molecules in the dense interstellar medium. Addition reactions allow unsaturated bonds to be fully hydrogenated, while abstraction reactions recreate radicals that may undergo radical–radical recombination reactions. Previous experimental work has indicated that double and triple C–C bonds are easily hydrogenated, but aldehyde –C=O bonds are not. Here, we investigate a total of 29 reactions of the hydrogen atom with propynal, propargyl alcohol, propenal, allyl alcohol, and
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Ferrero, Stefano, Cecilia Ceccarelli, Piero Ugliengo, Mariona Sodupe, and Albert Rimola. "Formation of Complex Organic Molecules on Interstellar CO Ices? Insights from Computational Chemistry Simulations." Astrophysical Journal 951, no. 2 (2023): 150. http://dx.doi.org/10.3847/1538-4357/acd192.

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Abstract The carbon (3P) atom is a reactive species that, according to laboratory experiments and theoretical calculations, condensates with interstellar ice components. This fact is of uttermost importance for the chemistry in the interstellar medium (ISM) because the condensation reaction is barrierless, and the subsequent species formed are still reactive given their open-shell character. Carbon condensation on CO-rich ices forms the C=C=O (3Σ−) species, which can be easily hydrogenated twice to form ketene (H2CCO). Ketene is very reactive in terrestrial conditions, usually found as an inte
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Lu, Shiru, Zhisen Meng, Peng Xie, Enwei Liang, and Zhao Wang. "Gas-phase formation of interstellar nucleobases from dehydrogenated formamide and vinyl cyanide." Astronomy & Astrophysics 656 (December 2021): A84. http://dx.doi.org/10.1051/0004-6361/202140744.

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Context. Cytosine, thymine, and uracil are three of the five primary nucleobases that function as the fundamental units of the genetic code in nucleic acids. In searching the extraterrestrial origins of microscopic life, previous studies have reported formation routes of nucleobases in interstellar ice analogs. The present work explores the possibility that nucleobases could form from small molecules through gas-phase reactions in the interstellar medium (ISM). Aims. We aim to search energetically favorable synthetic routes toward the formation of cytosine, thymine, and uracil via gas-phase re
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Inostroza, Natalia, Diego Mardones, Jose Cernicharo, et al. "Formation of complex organic molecules in ice mantles: An ab initio molecular dynamics study." Astronomy & Astrophysics 629 (August 30, 2019): A28. http://dx.doi.org/10.1051/0004-6361/201834035.

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We present a detailed simulation of a dust grain covered by a decamer of (CH3OH)10-ice-mantle, bombarded by an OH− closed-shell molecule with kinetic energies from 10–22 eV. The chemical pathways are studied through Born-Oppenheimer (ab initio) molecular dynamics. The simulations show that methanol ice-mantles can be a key generator of complex organic molecules (COMs). We report the formation of COMs such as methylene glycol (CH2(OH)2) and the OCH2OH radical, which have not been detected yet in the interstellar medium (ISM). We discuss the chemical formation of new species through the reaction
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Dissertations / Theses on the topic "Interstellar Medium - Radical‐Molecule Reactions"

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Barthel, Robert. "Growth of unsaturated, cyclic, and polycyclic aromatic hydrocarbons: Reactions under the conditions of the interstellar medium." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1238024025498-21465.

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Hydrocarbons, in particular polycyclic aromatic hydrocarbons (PAHs), have been long discussed to be carriers of interstellar infrared (IR) emission and ultraviolet (UV) absorption features. Yet, their origin in dense phases of the interstellar medium (ISM), such as molecular clouds, remains unclear. In this work, growth mechanisms based on ion-molecule reactions between cationic PAHs/hydrocarbons and methyne (CH) were investigated. The reaction type and the precursor were derived and selected from known chemical and physical properties of the ISM. These chemical reactions were characterised by
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Barthel, Robert. "Growth of unsaturated, cyclic, and polycyclic aromatic hydrocarbons: Reactions under the conditions of the interstellar medium." Doctoral thesis, Technische Universität Dresden, 2008. https://tud.qucosa.de/id/qucosa%3A23589.

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Hydrocarbons, in particular polycyclic aromatic hydrocarbons (PAHs), have been long discussed to be carriers of interstellar infrared (IR) emission and ultraviolet (UV) absorption features. Yet, their origin in dense phases of the interstellar medium (ISM), such as molecular clouds, remains unclear. In this work, growth mechanisms based on ion-molecule reactions between cationic PAHs/hydrocarbons and methyne (CH) were investigated. The reaction type and the precursor were derived and selected from known chemical and physical properties of the ISM. These chemical reactions were characterised by
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Pearcy, Adam C. "Non-covalent and covalent interactions between phenylacetylene and quinoline radical cations with polar and non-polar molecules in the gas phase." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/5990.

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Gas phase molecular clusters present an ideal medium for observing factors that drive chemical reactions without outside interferences from excessive solvent molecules. Introducing an ion into the cluster promotes ion-molecule interactions that may manifest in a variety of non-covalent or even covalent binding motifs and are of significant importance in many fields including atmospheric and astronomical sciences. For instance, in outer space, molecules are subject to ionizing radiation where ion-molecule reactions become increasingly competitive to molecule-molecule interactions. To elucidate
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Stavish, Leah. "Selected Ion Flow Tube studies of ion-molecule reactions relevant to the interstellar medium and Titan's atmosphere." 2009. http://purl.galileo.usg.edu/uga%5Fetd/stavish%5Fleah%5F200912%5Fms.

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Thesis (M.S.)--University of Georgia, 2009.<br>Directed by Nigel G. Adams. Includes an article accepted by, and an article published in, International journal of mass spectrometry. Includes bibliographical references.
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Jackson, Douglas M. "Selected ion flow tube studies of interest to the chemistry of ion-molecule reactions in the interstellar medium." 2007. http://purl.galileo.usg.edu/uga%5Fetd/jackson%5Fdouglas%5Fm%5F200705%5Fms.

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Tran, Thuy Dung. "Formování vody reakcemi aniontů i kationtů s molekulárním vodíkem při nízkých teplotách." Doctoral thesis, 2020. http://www.nusl.cz/ntk/nusl-411460.

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In the present work, the results of the experimental study of reactions of ions with molecular hydrogen in the temperature range 15 - 300 K using a 22-pole ion trap apparatus are presented. The reaction of OD- with para-enriched hydrogen was studied using a combination of the 22-pole ion trap apparatus with a para-hydrogen generator. Also reactions of O- with H2, D2, and HD were studied. These reactions have a channel of water production and a channel of hydrogen or deuterium transfer. Another field of study was a sequence of reactions of oxygen hydride cations with H2 and D2 which leads to th
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Book chapters on the topic "Interstellar Medium - Radical‐Molecule Reactions"

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Germain, Aurèle, Marta Corno, and Piero Ugliengo. "Computing Binding Energies of Interstellar Molecules by Semiempirical Quantum Methods: Comparison Between DFT and GFN2 on Crystalline Ice." In Computational Science and Its Applications – ICCSA 2021. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-86976-2_43.

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AbstractInterstellar Grains (IGs) spread in the Interstellar Medium (ISM) host a multitude of chemical reactions that could lead to the production of interstellar Complex Organic Molecules (iCOMs), relevant in the context of prebiotic chemistry. These IGs are composed of a silicate-based core covered by several layers of amorphous water ice, known as a grain mantle. Molecules from the ISM gas-phase can be adsorbed at the grain surfaces, diffuse and react to give iCOMs and ultimately desorbed back to the gas phase. Thus, the study of the Binding Energy (BE) of these molecules at the water ice grain surface is important to understand the molecular composition of the ISM and its evolution in time. In this paper, we propose to use a recently developed semiempirical quantum approach, named GFN-xTB, and more precisely the GFN2 method, to compute the BE of several molecular species at the crystalline water ice slab model. This method is very cheap in term of computing power and time and was already showed in a previous work to be very accurate with small water clusters. To support our proposition, we decided to use, as a benchmark, the recent work published by some of us in which a crystalline model of proton-ordered water ice (P-ice) was adopted to predict the BEs of 21 molecules relevant in the ISM. The relatively good results obtained confirm GFN2 as the method of choice to model adsorption processes occurring at the icy grains in the ISM. The only notable exception was for the CO molecule, in which both structure and BE are badly predicted by GFN2, a real pity due to the relevance of CO in astrochemistry.
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Conference papers on the topic "Interstellar Medium - Radical‐Molecule Reactions"

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Frum, C. I., J. J. OH, E. A. Cohen та H. M. Pickett. "High Resolution Infrared Fourier Transform Emission Spectroscopy and Rotational Spectroscopy of Metal Hydrides: 2Σ+ State of CaH". У High Resolution Fourier Transform Spectroscopy. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/hrfts.1992.thd6.

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Calcium hydride is an important astrophysical molecule which has been detected in the Sun [1,2] and other stars [3]. It is also believed that this free radical is an important constituent of the interstellar medium [4]. However, a search for the CaH in interstellar medium is hindered by the unavailability of accurate frequencies for the low-N rotational transitions.
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Thaddeus, Patrick. "Carbenes in the Interstellar Gas." In High Resolution Spectroscopy. Optica Publishing Group, 1993. http://dx.doi.org/10.1364/hrs.1993.tha1.

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Carbenes are a significant trace constituent of the gas in the interstellar medium (and in the expanding shell around at least one star), representing about one-sixth of the molecular species that have been identified in space. The identification of one of the most abundant and widespread interstellar carbenes, the cyclopropenylidene ring, C3H2, is described, together with recent laboratory work on the excited vibrational states of this molecule and on the geometrical structure of one of its isomers, the carbon chain carbene H2C3. A number of additional free carbines which might be detected in
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