Results 41 to 50 of about 2,262 (175)
Interstellar oxygen chemistry [PDF]
Astronomy & Astrophysics, 2001 We present results of chemical models for a variety of types of regions shown by SWAS observations to contain less O2 and H2O than previously expected. We identify time-dependent models for which O2 and H2O abundances meet the SWAS constraints and for which calculated abundances of other species are in harmony with measurements made primarily at ...
S. Viti +4 more
openaire +1 more source
Unusual Chemical Processes in Interstellar Chemistry: Past and Present
Frontiers in Astronomy and Space Sciences, 2021 The chemistry that occurs in interstellar clouds consists of both gas-phase processes and reactions on the surfaces of dust grains, the latter particularly on and in water-dominated ice mantles in cold clouds.
Eric Herbst, Eric Herbst
doaj +1 more source
Cationic Noble-Gas Hydrides: From Ion Sources to Outer Space
Frontiers in Chemistry, 2020 Cationic species with noble gas (Ng)-hydrogen bonds play a major role in the gas-phase ion chemistry of the group 18 elements. These species first emerged more than 90 years ago, when the simplest HeH+ and HeH2+ were detected from ionized He/H2 mixtures.
Felice Grandinetti, Felice Grandinetti
doaj +1 more source
Open questions on carbon-based molecules in space
Communications Chemistry, 2022 It has been a great joint achievement of astronomy, laboratory spectroscopy and quantum chemistry to identify interstellar molecules in various astronomical environments and piece together their origins story from the fragmented evidence.
Christopher S. Hansen +3 more
doaj +1 more source
Proton and Electron Irradiations of CH4:H2O Mixed Ices
Atoms, 2023 The organic chemistry occurring in interstellar environments may lead to the production of complex molecules that are relevant to the emergence of life. Therefore, in order to understand the origins of life itself, it is necessary to probe the chemistry ...
Duncan V. Mifsud +9 more
doaj +1 more source
Sustained oscillations in interstellar chemistry models [PDF]
Astronomy & Astrophysics, 2020 Context. Nonlinear behavior in interstellar chemical models has been recognized for 25 years now. Different mechanisms account for the possibility of multiple fixed-points at steady-state, characterized by the ionization degree of the gas. Aims. Chemical oscillations are also a natural behavior of nonlinear chemical models.
Evelyne Roueff, Jacques Le Bourlot
openaire +3 more sources
Nature Communications, 2018 Interstellar silicates play a key role in star formation, however their synthetic routes are not fully understood. Here, the authors provide evidence for the formation of SiO2 along with SiO via low-temperature gas phase chemistry.
Tao Yang +5 more
doaj +1 more source
Interstellar Sulfur Chemistry [PDF]
Symposium - International Astronomical Union, 1980 This paper summarizes results of a chemical model of SO, CS, and OCS chemistry in dense clouds.
Sheo S. Prasad, Wesley T. Huntress
openaire +1 more source
The first steps of interstellar phosphorus chemistry [PDF]
Astronomy & Astrophysics, 2020 Context. Phosphorus-bearing species are essential to the formation of life on Earth, however they have barely been detected in the interstellar medium. In particular, towards star-forming regions only PN and PO have been identified so far. Since only a small number of detections of P-bearing molecules are available, their chemical formation pathways ...
J. Chantzos +6 more
openaire +6 more sources
Spectroscopy and Chemical Dynamics
CHIMIA, 2010 Chemical physics and molecular spectroscopy are topics with a traditionally strong emphasis in the department. Current research focuses on the spectroscopic characterization of transient molecules present in interstellar space and the ...
John P. Maier, Stefan Willitsch
doaj +1 more source