Results 81 to 90 of about 793,175 (240)
Influence of Gamma-Ray Emission on the Isotopic Composition of Clouds in the Interstellar Medium [PDF]
, 2011 We investigate one mechanism of the change in the isotopic composition of cosmologically distant clouds of interstellar gas whose matter was subjected only slightly to star formation processes.
A. A. Abdo +64 more
core +1 more source
Revisiting CN− Formation Mechanisms in Electron Collisions with Benzonitrile
ChemPhysChem, Volume 27, Issue 1, January 2026.This study explores negative ion formation via electron attachment, revealing CN− formation at 3.0 and 7–10 eV. Dissociation pathways are analyzed using G4(MP2) and CASPT2 calculations, highlighting the coupling between the π4* and σ* resonances critical for interstellar chemistry. Radiation‐induced processes in the aromatic cyano compound benzonitrile
Rodrigo Rodrigues +8 more
wiley +1 more source
Two Extrasolar Asteroids with Low Volatile-Element Mass Fractions
, 2012 Using ultraviolet spectra obtained with the Cosmic Origins Spectrograph on the Hubble Space Telescope, we extend our previous ground-based optical determinations of the composition of the extrasolar asteroids accreted onto two white dwarfs, GD 40 and ...
Armitage +42 more
core +1 more source
Models for Galactic cosmic-ray propagation [PDF]
, 2001 A new numerical model of particle propagation in the Galaxy has been developed, which allows the study of cosmic-ray and gamma-ray production and propagation in 2D or 3D, including a full reaction network.
A.W. Strong +38 more
core +3 more sources
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 Deuterium Fractionation of NH3 in Massive Star-forming Regions
The Astrophysical JournalDeuteration is sensitive to environmental conditions in star-forming regions. To investigate NH _2 D chemistry, we compared the spatial distribution of ortho-NH _2 D ${1}_{11}^{s}-{1}_{01}^{a}$ , NH _3 (1,1), and NH _3 (2,2) in 12 late-stage massive star-
Yuqiang Li +8 more
doaj +1 more source
The abundance of interstellar lithium
The Astrophysical Journal, 1984 The interstellar Li I 6707-A absorption line is detected toward Rho Oph A at an equivalent width of 3.1 + or - 1.9 (3 sigma)mA. Upper limits near 1 mA also are found toward seven other stars, including 55 Cyg, toward which relatively strong Li I absorption was previously reported.
openaire +1 more source
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
core +2 more sources
Interstellar Migration, the Population ‘Problem’ and the Climate Emergency
Critical Quarterly, EarlyView.
Anna Hartnell
wiley +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 +6 more
wiley +1 more source