Results 111 to 120 of about 10,194 (274)
Molecular processes from the AGB to the PN stage [PDF]
, 2011 Many complex organic molecules and inorganic solid-state compounds have been observed in the circumstellar shell of stars (both C-rich and O-rich) in the transition phase between Asymptotic Giant Branch (AGB) stars and Planetary Nebulae (PNe). This short (~100-10.000 years) phase of stellar evolution represents a wonderful laboratory for astrochemistry
arxiv +1 more source
It Remains a Cage: Ionization Tolerance of C60 Fullerene in Planetary Nebulae [PDF]
arXiv, 2021 We demonstrate that by combining two robust theoretical quantum chemistry calculation techniques, stepwise ionization of C60 fullerene by UV and extreme UV photons can in principle occur up to a limit as high as q=+26 before coulomb explosion of the cage.
arxiv
Interstellar dimethyl ether gas-phase formation: a quantum chemistry and kinetics study [PDF]
, 2018 Dimethyl ether is one of the most abundant interstellar complex organic molecules. Yet its formation route remains elusive. In this work, we have performed electronic structure and kinetics calculations to derive the rate coefficients for two ion ...
Balucani, Nadia +6 more
core +3 more sources
Chemistry – A European Journal, Volume 30, Issue 57, October 11, 2024.This study investigates the ability of the carbonaceous meteorite CV3 Allende to act as a catalyst in electrochemical interactions, triggering electrocatalytic reactions resulting in nitrogen (N2) fixation and conversion to ammonia. Additionally, the evolution of crucial compounds such as H2, CN− and sulfur/H2S was observed, along with the detection of
Lucas Fernandez +3 more
wiley +1 more source
Natural Sciences, Volume 4, Issue 4, October 2024.Large free aromatic species, with up to 61 carbon atoms, were detected in grains of the Ryugu carbonaceous asteroid using ultra‐sensitive two‐step laser mass spectrometry. This discovery confirms the presence of large polycyclic aromatic hydrocarbons in the interstellar medium and provides new information on the formation and evolution of organic ...
Hassan Sabbah +3 more
wiley +1 more source
Reaction Networks For Interstellar Chemical Modelling: Improvements and Challenges
, 2010 We survey the current situation regarding chemical modelling of the synthesis of molecules in the interstellar medium. The present state of knowledge concerning the rate coefficients and their uncertainties for the major gas-phase processes -- ion ...
Agundez, M. +12 more
core +3 more sources
The Thermal Structure and Composition of Jupiter's Great Red Spot From JWST/MIRI
Journal of Geophysical Research: Planets, Volume 129, Issue 10, October 2024.Abstract Jupiter's Great Red Spot (GRS) was mapped by the James Webb Space Telescope (JWST)/Mid‐Infrared Instrument (4.9–27.9 μ ${\upmu }$m) in July and August 2022. These observations took place alongside a suite of visual and infrared observations from; Hubble, JWST/NIRCam, Very Large Telescope/VISIR and amateur observers which provided both spatial ...
Jake Harkett +17 more
wiley +1 more source
Quantum Behavior of Spin-Orbit Inelastic Scattering of C-Atoms by D2 at Low Energy
Frontiers in Chemistry, 2019 Fine-structure populations and collision–induced energy transfer in atoms are of interest for many fields, from combustion to astrophysics. In particular, neutral carbon atoms are known to play a role in interstellar media, either as probes of physical ...
Astrid Bergeat +4 more
doaj +1 more source
Recent Astrochemical Results on Star-Forming Regions [PDF]
arXiv, 2007 This review discusses recent results on the astrochemistry of (mostly high-mass) star-forming regions. After an introduction on the use of chemistry in astrophysics and some basic concepts of astrochemistry, specific results are presented. Highlighted areas are the use of chemistry in the search for massive circumstellar disks, the interaction of ...
arxiv
High-Temperature Chemistry in External Galaxies [PDF]
, 2017 In external galaxies, some galaxies have higher activities of star formation and central supermassive black holes. The interstellar medium in those galaxies can be heated by different mechanisms such as UV-heating, X-ray heating, cosmic-ray heating, and shock/mechanical heating.
arxiv +1 more source