Results 31 to 40 of about 8,687 (242)
Linear or Cyclic? Theoretical Investigation of Astrophysically Relevant Magnesium-Bearing MgC<sub>n</sub>H Carbon Chains and Related Isomers. [PDF]
J Comput ChemThe global minimum energy structure of astrophysically relevant MgCnH systems is linear when n is even, and cyclic when n is odd. ABSTRACT Magnesium‐containing molecules, including MgC2H, MgC4H, and MgC6H, have been detected in the interstellar medium, largely facilitated by their high dipole moments.
Gomes AKMS +3 more
europepmc +2 more sources
Geochemistry of the cretaceous-tertiary transition boundary at Blake Nose (N. W. Atlantic): Cosmogenic Ni [PDF]
Journal of the Serbian Chemical Society, 2004 The Cretaceous-Tertiary (KT) boundary transition at the Blake Nose Plateau recovered by ODP Leg 171B (site 1049, hole A, core 17X, section 2) contains an ejecta bed (thickness ca. 17 cm) marking a late Cretaceous asteroid impact.
Premović Pavle I. +3 more
doaj +1 more source
Gas-phase Ortho-to-para Ratio of Formaldehyde Formed at Low Temperatures in Laboratory Ices
The Astrophysical Journal Letters, 2023 The ortho-to-para ratio (OPR) of formaldehyde (H _2 CO) has been used as a probe to estimate the formation temperature of molecules in interstellar, circumstellar, and cometary environments, relying on the assumption that nuclear spin conversion is ...
K. M. Yocum +4 more
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The Planetary Science Journal, 2023 Infrared (IR) spectra are needed for both laboratory and observational studies of extraterrestrial ices, both within the solar system, such as for trans-Neptunian objects, comets, and Titan, and in the interstellar medium.
Reggie L. Hudson, Perry A. Gerakines
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Infrared Spectra and Vapor Pressures of Crystalline C2N2, with Comparisons to Crystalline HCN
The Planetary Science Journal, 2023 In a continuation of our work on nitriles, we have examined cyanogen (C _2 N _2 ) as a crystalline solid, comparing the results to our recent work on crystalline hydrogen cyanide (HCN).
Reggie L. Hudson, Perry A. Gerakines
doaj +1 more source
Prompt, 2018 A major challenge in teaching is helping students integrate course concepts to understand the big picture of a field and apply those concepts in new situations.
Olivia H. Wilkins, Camillus F. Buzard
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Molecules, 2023 A microwave-promoted multicomponent reaction of isatins, α-amino acids and 1,4-dihydro-1,4-epoxynaphthalene is achieved under environmentally friendly conditions, delivering oxygen-bridged spirooxindoles within 15 min in good to excellent yields.
Yaojing Shi, Hua Zhao, Yufen Zhao
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Astrochemistry: A Summary [PDF]
Proceedings of the International Astronomical Union, 1987 A brief summary of the content of the papers comprising the symposium is presented.
openaire +4 more sources
The astrochemistry of life [PDF]
Astronomy and Geophysics, 2001 There are many unanswered astronomical questions about the chemical basis of life; a meeting held in August this year by the Astrophysical Chemistry Group of the RAS and the Royal Society of Chemistry took as its starting point the understanding of a number of questions, and reviews of progress towards the answers, report Anita Richards and Peter Sarre.
Anita M. S. Richards, Peter J. Sarre
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Astrochemistry: Synthesis and Modelling [PDF]
, 2012 We discuss models that astrochemists have developed to study the chemical composition of the interstellar medium. These models aim at computing the evolution of the chemical composition of a mixture of gas and dust under as- trophysical conditions. These conditions, as well as the geometry and the physical dynamics, have to be adapted to the objects ...
Wakelam, Valentine +2 more
openaire +5 more sources