Results 71 to 80 of about 30,505 (211)
The Astrophysical JournalIce chemistry in the dense, cold interstellar medium (ISM) is probably responsible for the formation of interstellar complex organic molecules (COMs). Recent laboratory experiments performed at T ∼ 4 K have shown that irradiation of CO:N _2 ice samples ...
Rafael Martín-Doménech +3 more
doaj +1 more source
The Relationship between the Optical Depth of the 9.7 micron Silicate Absorption Feature and Infrared Differential Extinction in Dense Clouds [PDF]
, 2007 We have examined the relationship between the optical depth of the 9.7 micron silicate absorption feature (tau_9.7) and the near-infrared color excess, E(J-Ks) in the Serpens, Taurus, IC 5146, Chameleon I, Barnard 59, and Barnard 68 dense clouds/cores ...
A. C. A. Boogert +15 more
core +3 more sources
Interstellar deuterium in cold dense clouds
The Astrophysical Journal, 1993 The mechanism for deuterium fractionation in interstellar clouds is considered within the boundaries of the theory of Dalgarno & Lepp. The abundance of D atoms and fractional ionization in cold clouds are derived from the observational data of molecular ions.
openaire +1 more source
Sampling the volcanic plumes at Io: Impact speeds and shock conditions
Meteoritics &Planetary Science, Volume 61, Issue 2, Page 241-271, February 2026.Abstract The desire to sample material from the interior of Io, by flying through its volcanic plumes, requires consideration of the flyby speed and the types of sample collection techniques that can be utilized. Low speed collection (1–2.5 km s−1) would require an orbit around Io itself, which is unlikely due to the accumulated radiation dose that ...
M. J. Burchell +2 more
wiley +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
Carbon Chemistry in Dense Molecular Clouds: Theory and Observational Constraints [PDF]
, 1990 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
Using deuterated H3+ and other molecular species to understand the formation of stars and planets
, 2012 The H3+ ion plays a key role in the chemistry of dense interstellar gas clouds where stars and planets are forming. The low temperatures and high extinctions of such clouds make direct observations of H3+ impossible, but lead to large abundances of H2D ...
Lucas R., Pagani L., van der Werf P. P.
core +1 more source
Heat Transfer, Volume 55, Issue 1, Page 764-774, January 2026.ABSTRACT This review explores the impact of gravitational instability on convective heat transfer, integrating existing research results and theoretical models. Gravitational instability is vital in promoting or hindering convective actions in different systems, such as atmospheric events, ocean currents, and industrial processes.
Hossam A. Nabwey +3 more
wiley +1 more source
Methanol in the sky with diamonds [PDF]
The present of gas phase methanol in dense interstellar molecular clouds was established by radio detection of its rotational emission lines. However, the position, width, and profile of a absorption band near 1470 cm(exp -1) in the IR spectra of many ...
Allamandola, L. J. +3 more
core +1 more source
Effects of H2 coating of grains on depletion of molecular species
, 2012 Physical conditions in dense and cold regions of interstellar clouds favour the formation of ice mantles on the surfaces of interstellar grains. It is predicted that most of the gaseous species heavier than H2 or He will adsorb onto the grains and will ...
Hasegawa, Tatsuhiko I., Morata, Oscar
core +1 more source