Results 51 to 60 of about 9,417 (235)

Fire from Ice - Massive Star Birth from Infrared Dark Clouds

, 2017
I review massive star formation in our Galaxy, focusing on initial conditions in Infrared Dark Clouds (IRDCs), including the search for massive pre-stellar cores (PSCs), and modeling of later stages of massive protostars, i.e., hot molecular cores (HMCs).
Tan, Jonathan C.
core   +1 more source

Solid and Gaseous Methane in IRAS 23385+6053 as Seen with Open JWST Data

The Astrophysical Journal Letters
We present a new description of the 7.7 μ m region towards the high-mass star-forming region IRAS 23385+6053 taken from the open James Webb Space Telescope Mid-Infrared Instrument Medium Resolution Spectrometer data.
Ruslan Nakibov, Varvara Karteyeva, Igor Petrashkevich, Maksim Ozhiganov, Mikhail Medvedev, Anton Vasyunin   +5 more
doaj   +1 more source

Organic Molecules in Interstellar Space: Latest Advances

Frontiers in Astronomy and Space Sciences, 2022
Although first considered as too diluted for the formation of molecules in-situ and too harsh an environment for their survival, the interstellar medium has turned out to host a rich palette of molecular species: to date, 256 species, not counting ...
Michel Guélin, Jose Cernicharo
doaj   +1 more source

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, Ceccarelli, Cecilia, Codella, Claudio, Falcinelli, Stefano, Lago, Noelia Faginas, Rosi, Marzio, Skouteris, Dimitrios   +6 more
core   +3 more sources

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

Infrared Spectra of Solid HCN Embedded in Various Molecular Environments for Comparison with the Data Obtained with JWST

The Astrophysical Journal Letters
Hydrogen cyanide (HCN) molecules serve as an important tracer for the chemical evolution of elemental nitrogen in the regions of star and planet formation.
Maksim Ozhiganov, Mikhail Medvedev, Varvara Karteyeva, Ruslan Nakibov, Uliana Sapunova, Vadim Krushinsky, Ksenia Stepanova, Anastasia Tryastsina, Aleksandr Gorkovenko, Gleb Fedoseev, Anton Vasyunin   +10 more
doaj   +1 more source

A hybrid moment equation approach to gas-grain chemical modeling [PDF]

, 2011
[Context] The stochasticity of grain chemistry requires special care in modeling. Previously methods based on the modified rate equation, the master equation, the moment equation, and Monte Carlo simulations have been used. [Aims] We attempt to develop a
Awad, B. Parise, Barzel, Barzel, Barzel, Biham, Biham, Caselli, Chang, Charnley, Charnley, Charnley, Charnley, Cuppen, F. Du, Garrod, Garrod, Garrod, Gillespie, Gillespie, Gillespie, Gillespie, Green, Hasegawa, Hasegawa, Lipshtat, Mattis, McQuarrie, Menten, Ohkubo, Rae, Stantcheva, Stantcheva, Stantcheva, Tielens, Tielens, Vasyunin, Vasyunin, Woodall   +38 more
core   +2 more sources

Satellites and Small Bodies With ALMA: Insights Into Solar System Formation and Evolution

AGU Advances, Volume 6, Issue 6, December 2025.
Abstract Our understanding of the formation and evolution of planetary systems has made major advances in the past decade. This progress has been driven in large part by the Atacama Large Millimeter/submillimeter Array (ALMA), which has given us an unprecedented view of solar system bodies themselves, and of the structure and chemistry of forming ...
Katherine de Kleer, Michael E. Brown, Martin Cordiner, Richard Teague   +3 more
wiley   +1 more source

Atomistic Modeling of Methyl Formate and Glycolaldehyde Formation on Interstellar Dirty Ice Mantles via a “Radical + Ice” Mechanism

ChemPlusChem, Volume 90, Issue 11, November 10, 2025.
The presence of interstellar complex organic molecules (COMs) has been baffling astrochemists for a long time. Methyl formate and glycolaldehyde are widely detected but their abundances mismatch kinetic astrochemical model predictions. Here, the formation of these two COMs is characterized onto a mixed ice surface, highlighting the importance of ...
Jessica Perrero, Stefano Pantaleone, Piero Ugliengo, Albert Rimola   +3 more
wiley   +1 more source

Isolation and Structure Elucidation of the Heterocumulene Anions [NCC‐L]− (L=CO, CS, N2)

Angewandte Chemie, Volume 137, Issue 13, March 24, 2025.
The cumulated 5‐atomic cyanodiazomethanide [NCCNN]− and thioketenyl anion [NCCCS]− were synthesized from the metalated ylide and ketenyl anion, respectively. Both anions exhibit unexpected stability, but with notable structural differences. While the cyanodiazomethanide features a distinctly bent geometry, the thioketenyl anion was found to be linear ...
Quentin Le Dé, Yihao Zhang, Lili Zhao, Felix Krischer, Kai‐Stephan Feichtner, Gernot Frenking, Viktoria H. Gessner   +6 more
wiley   +2 more sources