Results 81 to 90 of about 877,168 (238)

Enhanced cosmic-ray flux toward zeta Persei inferred from laboratory study of H3+ - e- recombination rate

, 2003
The H3+ molecular ion plays a fundamental role in interstellar chemistry, as it initiates a network of chemical reactions that produce many interstellar molecules. In dense clouds, the H3+ abundance is understood using a simple chemical model, from which
A. Al-Khalili, A. Ehlerding, A. J. Huneycutt, A. Neau, AE Orel, B. J. McCall, BD Savage, BJ McCall, BJ McCall, BJ McCall, CM Lindsay, D Strasser, E Herbst, EF van Dishoeck, F. Hellberg, F. Österdahl, G Sundström, G. H. Dunn, H Kreckel, IF Schneider, J. Semaniak, JA Cardelli, JB Paul, M Larsson, M. Larsson, MJ Jensen, N. Djuric, O. Novotny, R Plasil, R. J. Saykally, R. Thomas, RC Bohlin, S Lepp, S. Kalhori, SL Guberman, T Tanabe, T. R. Geballe, TR Geballe, TR Geballe, V Kokoouline, WD Watson   +40 more
core   +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

Dense molecular clouds in the SN2008fp host galaxy [PDF]

, 2014
(abridged) We use observations of interstellar absorption features, such as atomic and molecular lines as well as diffuse interstellar bands (DIBs), towards SN2008fp to study the physical properties of extra-galactic diffuse interstellar clouds in the ...
Cox, N. L. J., Patat, F.
core   +1 more source

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, Florent Calvo, Rasif William, Bilal Rasul, Masoomeh Mahmoodi‐Darian, Paul Scheier, Olof Echt   +6 more
wiley   +1 more source

Unusually Weak Diffuse Interstellar Bands toward HD 62542 [PDF]

, 2001
As part of an extensive survey of diffuse interstellar bands (DIBs), we have obtained optical spectra of the moderately reddened B5V star HD 62542, which is known to have an unusual UV extinction curve of the type usually identified with dark clouds. The
Adamson A. J., Benjamin J. McCall, Cami J., Daniel E. Welty, Donald G. York, Ehrenfreund P., Gredel R., Gredel R., Gredel R., Heger M. L., Jenniskens P., Jenniskens P., Jenniskens P., Julie Thorburn, Kerr T. H., Krelowski J., L. M. Hobbs, Leger A., Paule Sonnentrucker, Sarre P. J., Snow T. P., Snow T. P., Sonnentrucker P., Sonnentrucker P., Theodore P. Snow, van der Zwet G. P., Walker D. D.   +26 more
core   +3 more sources

Aditional Ultra-High-Resolution Observations of Ca+ Ions in the Local Insterstellar Medium [PDF]

, 1998
We present ultra-high-resolution (0.35 km s−1 FWHM) observations of the interstellar Ca K line towards seven nearby stars. The spectral resolution was sufficient to resolve the line profiles fully, thereby enabling us to detect hitherto unresolved ...
Crawford, IA, Lallement, R, Welsh, BY
core  

Formation of All Three C2H4O Isomers—Ethylene Oxide (c-C2H4O), Acetaldehyde (CH3CHO), and Vinyl Alcohol (CH2CHOH)—in Ethanol-containing Interstellar Analog Ices

The Astrophysical Journal
Oxygen-containing complex organic molecules are key precursors to biorelevant compounds fundamental for the origins of life. However, the untangling of their interstellar formation mechanisms has just scratched the surface, especially for oxygen ...
Jia Wang, Chaojiang Zhang, Joshua H. Marks, Ralf I. Kaiser   +3 more
doaj   +1 more source

Kinetics and Thermodynamics of Tautomerization Reactions of 1,1‐ and 1,2‐Ethenediols

International Journal of Chemical Kinetics, Volume 57, Issue 12, Page 687-696, December 2025.
ABSTRACT Tautomerism is a common phenomenon amongst organic molecules with easily interconvertible isomers, which can impact drug action and toxicity. Here we are interested in the enols of carboxylic acids, which are known to be much less stable than their acid counterparts.
Judith Würmel, John M. Simmie
wiley   +1 more source

Is the Sun Embedded in a Typical Interstellar Cloud?

, 2008
The physical properties and kinematics of the partially ionized interstellar material near the Sun are typical of warm diffuse clouds in the solar vicinity.
A. Czechowski, A.C. Cummings, A.C. Cummings, B. Flynn, B.D. Savage, B.E. Wood, B.E. Wood, C. Heiles, C.S. Bowyer, C.S. Weller, D.E. Welty, E. Gruen, E. Möbius, E. Salerno, E.B. Jenkins, J. Tinbergen, J. Vallerga, J.D. Slavin, J.L. Han, J.L. Linsky, J.M. Ajello, J.P. Simpson, K. Cheng, L.A. Marschall, L.M. Haffner, L.M. Haffner, M. MacLow, M. Witte, M. Wolleben, N. Lehner, N.V. Pogorelov, P. Frisch, P. Routly Jr., P.B. Lucke, P.C. Frisch, P.C. Frisch, P.C. Frisch, P.C. Frisch, P.C. Frisch, P.C. Frisch, P.M. Gondhalekar, Priscilla C. Frisch, R. Crutcher, R. Lallement, R. Lallement, R. Ratkiewicz, R. Shetty, R.J. Rand, R.J. Reynolds, R.J. Reynolds, S. Redfield, S. Redfield, S. Redfield, S.M. Kahn, T.F. Adams, T.J. Linde, V. Piirola, V.V. Izmodenov   +57 more
core   +1 more source

Submillimeterwave Spectroscopy of and Interstellar Search for Nitrosomethane: CH3NO

The Astrophysical Journal
New measurements of nitrosomethane (CH _3 NO), a formamide isomer, were done up to 660 GHz. The molecule exhibits internal rotation motion from the CH _3 group, and therefore the analysis with a dedicated rho-axis method code, RAM36, was used. A total of
Laurent Margulès, Zachary T. P. Fried, Alex N. Byrne, Brett A. McGuire, Luyao Zou, Roman A. Motiyenko, J.-C. Guillemin   +6 more
doaj   +1 more source