Results 81 to 90 of about 30,505 (211)
Molecule Formation in Cool, Dense Interstellar Clouds [PDF]
Symposium - International Astronomical Union, 1980 A discussion is given of the general processes and considerations that arise in attempting to understand molecular reactions in cool, dense interstellar clouds. Basic elements of the gas phase, “ion-molecule” scheme are given explicitly before surveying topics in which there is considerable current activity.
openaire +1 more source
Entropy Export and Chemical Reactions in Plasmas
Plasma Processes and Polymers, Volume 23, Issue 1, January 2026.In a non‐equilibrium plasma, energy is transferred to molecules by electron‐impact (1), collisions among excited molecules (2), and Joule heating (3). The entropy balance for this open system relates the energy available per molecule to changes in entropy, which determines plasma‐based gas conversion. ABSTRACT Is plasma truly a “fourth state of matter”?
Dirk Hegemann, Ramses Snoeckx
wiley +1 more source
The Astrophysical Journal Supplement SeriesWe investigate the evolutionary dynamics with archival continuum and line data of 27 giant molecular clouds (GMCs) in the Milky Way, focusing on their influence on star formation. Examining the dense gas mass fraction (DGMF) among the GMCs, we categorize
Wenjun Zhang +14 more
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Adsorption of Helium on Cationic or Anionic Tetracene and Pentacene
Small Structures, Volume 7, Issue 1, January 2026.How does the arrangement of helium atoms that are adsorbed on tetracene or pentacene ions change with increasing coverage? When does the adsorption layer change from 1D to 2D, and to 3D? Is the transition abrupt? Are the helium atoms localized? Is the arrangement the same for cations and anions? What changes as the acene grows in length?
Miriam Kappe +6 more
wiley +1 more source
Chemistry in Dense Molecular Clouds: Theory and Observational Constraints [PDF]
, 1988 For the most part, gas phase models of the chemistry of dense molecular clouds predict the abundances of simple species rather well. However, for larger molecules and even for small systems rich in carbon these models often fail spectacularly.
Blake, Geoffrey A.
core
Star Formation by Supernova Implosion
The Astrophysical Journal LettersRecent hydrodynamical simulations of the late stages of supernova remnant (SNR) evolution have revealed that as they merge with the ambient medium, SNRs implode, leading to the formation of dense clouds in their center.
Leonard E. C. Romano +2 more
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The chemistry of dense interstellar clouds [PDF]
The basic theme of this program is the study of molecular complexity and evolution in interstellar and circumstellar clouds incorporating the biogenic elements.
Irvine, W. M.
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The first results from the Herschel-HIFI mission
, 2012 This paper contains a summary of the results from the first years of observations with the HIFI instrument onboard ESA's Herschel space observatory. The paper starts by outlining the goals and possibilities of far-infrared and submillimeter astronomy ...
van der Tak, Floris
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ChemPlusChem, Volume 90, Issue 11, November 10, 2025.The presence of interstellar complex organic molecules (COMs) has been baffling astrochemists for a long time. Methyl formate and glycolaldehyde are widely detected but their abundances mismatch kinetic astrochemical model predictions. Here, the formation of these two COMs is characterized onto a mixed ice surface, highlighting the importance of ...
Jessica Perrero +3 more
wiley +1 more source
Nondiffusive Formation of Acetaldehyde on Interstellar Ices: An Atomistic Perspective
The Astrophysical Journal LettersThe detection of interstellar complex organic molecules (iCOMs), such as acetaldehyde (CH _3 CHO), in cold astrophysical environments challenges standard grain-surface chemistry models, which rely on radical diffusion.
Berta Martínez-Bachs, Albert Rimola
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