Results 121 to 130 of about 10,661 (258)

Astrochemistry in an Ion Storage Ring

Journal of Physics: Conference Series, 2012
Storage ring studies of low energy electron collisions with molecular ions have been carried out for dissociative recombination (DR) of fluorine-bearing molecules. Here we report on work aiming to improve the understanding of astrochemistry involving HF, a possible spectroscopic tracer of interstellar H2.
Steffen Novotny, Dmitri A. Orlov, Wolf D. Geppert, Claude Krantz, Annemieke Petrignani, Michael Lestinsky, Max H. Berg, Dirk Schwalm, Dirk Schwalm, Mathias Hamberg, A. Shornikov, Manfred Grieser, Alexander Wolf, M. B. Mendes, M. Froese, Julia Stützel, O. Novotný, O. Novotný, Daniel Wolf Savin, Florian Grussie, Christian Nordhorn, Henrik Buhr, Henrik Buhr   +22 more
openaire   +4 more sources

The role of ultraviolet photons in circumstellar astrochemistry [PDF]

Chinese Journal of Chemical Physics, 2020
Stars with masses between 1 and 8 solar masses (M⊙) lose large amounts of material in the form of gas and dust in the late stages of stellar evolution, during their Asymptotic Giant Branch (AGB) phase. Such stars supply up to 35% of the dust in the interstellar medium and thus contribute to the material out of which our solar system formed. In addition,
openaire   +5 more sources

Stereodynamical Effects by Anisotropic Intermolecular Forces

Frontiers in Chemistry, 2019
Electric and magnetic field gradients, arising from sufficiently strong anisotropic intermolecular forces, tend to induce molecular polarization which can often modify substantially the results of molecular collisions, especially at low rotational ...
Daniela Ascenzi, Mario Scotoni, Paolo Tosi, David Cappelletti, Fernando Pirani   +4 more
doaj   +1 more source

Dark-matter halo mergers as a fertile environment for low-mass Population III star formation

, 2014
While Population III stars are typically thought to be massive, pathways towards lower-mass Pop III stars may exist when the cooling of the gas is particularly enhanced. A possible route is enhanced HD cooling during the merging of dark-matter halos. The
Bovino, S., Grassi, T., Latif, M. A., Schleicher, D. R. G.   +3 more
core   +1 more source

Nonadiabatic Photodynamics of Amantadine and 1‐Cyanoadamantane Cations

ChemPhysChem, Volume 25, Issue 21, November 4, 2024.
Nonadiabatic molecular dynamics simulations (trajectory surface hopping at the semiempirical configuration interaction singles and doubles level) predict faster internal conversion in the amantadine cation than in the cyanoadamantane cation despite a larger initial energy gap for the former.
Bonasree Roy, Evgenii Titov, Peter Saalfrank   +2 more
wiley   +1 more source

Infrared Band Strengths and Other Properties of Three Interstellar Compounds—Amorphous Isocyanic Acid, Formaldehyde, and Formic Acid

The Astrophysical Journal
Infrared (IR) spectral features of interstellar and solar system ices have been attributed to solid organic and inorganic compounds for over 50 yr, but in many cases the laboratory IR data needed to fully quantify such work have never been published ...
Reggie L. Hudson, Yukiko Y. Yarnall, Perry A. Gerakines   +2 more
doaj   +1 more source

From Meteorite to Life's Building Blocks: A possible Electrochemical Pathway to Amino Acids and Peptide Bonds

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, Farzaneh Yari, Günter Hesser, Wolfgang Schöfberger   +3 more
wiley   +1 more source

The Effect of an Inert Solid Reservoir on Molecular Abundances in Dense Interstellar Clouds

Open Astronomy, 2012
The question, what is the role of freeze-out of chemical species in determining the molecular abundances in the interstellar gas is a matter of debate.
Kalvāns Juris, Shmeld Ivar
doaj   +1 more source

Formation of Hydrogen, Oxygen, and Hydrogen Peroxide in Electron Irradiated Crystalline Water Ice

, 2005
Water ice is abundant both astrophysically, for example in molecular clouds, and in planetary systems. The Kuiper belt objects, many satellites of the outer solar system, the nuclei of comets and some planetary rings are all known to be water-rich ...
Averna D., Cooper B. H., David Jewitt, Flower D. R., Gerakines P. A., Gerakines P. A., Hendrix A. R., Hovington P., Pirronello V., Ralf I. Kaiser, Tielens A. G. G. M., Weijun Zheng   +11 more
core   +1 more source

Clouds, Clumps, Cores & Comets - a Cosmic Chemical Connection?

, 2008
We discuss the connection between the chemistry of dense interstellar clouds and those characteristics of cometary matter that could be remnants of it. The chemical evolution observed to occur in molecular clouds is summarized and a model for dense core ...
Charnley, S. B., Rodgers, S. D.
core   +2 more sources