Results 111 to 120 of about 8,526 (198)

Astrochemistry: Synthesis and Modelling [PDF]

In the book "Astrochemistry and Astropbiology", edited by Ian W. M. Smith, Charles S. Cockell and Sydney Leach, Publisher: Springer; 2013 edition (October 27, 2012), 2013
We discuss models that astrochemists have developed to study the chemical composition of the interstellar medium. These models aim at computing the evolution of the chemical composition of a mixture of gas and dust under as- trophysical conditions. These conditions, as well as the geometry and the physical dynamics, have to be adapted to the objects ...
arxiv  

PREBIOTIC ASTROCHEMISTRY IN THE "THz-GAP" [PDF]

Proceedings of the 2021 International Symposium on Molecular Spectroscopy, 2020
Fundamental biological molecules such as amino acids and sugars have been discovered in meteorites, but none of these species have yet been definitively detected in the interstellar medium (ISM). While both the number of detected interstellar molecules and their chemical complexity continue to increase, understanding of the processes leading to their ...
openaire   +2 more sources

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

Efficient calculation of van der Waals dispersion coefficients with time-dependent density functional theory in real time: application to polycyclic aromatic hydrocarbons

, 2007
The van der Waals dispersion coefficients of a set of polycyclic aromatic hydrocarbons, ranging in size from the single-cycle benzene to circumovalene (C66H20), are calculated with a real-time propagation approach to time-dependent density functional ...
Alberto Castro, Flower D. R., Giacomo Mulas, Giuliano Malloci, London F., Mahanty J., Miguel A. L. Marques, Parsegian V. A., Siegel G. J., Silvana Botti   +9 more
core   +3 more sources

Single‐Step Control of Liquid–Liquid Crystalline Phase Separation by Depletion Gradients

Advanced Materials, Volume 36, Issue 28, July 11, 2024.
Different sizes of nanoparticles with concentration gradients control the liquid–liquid crystalline phase separation (LLCPS) speed and induce different morphologies of tactoids with positional order. Nanoparticles can be templated by LLCPS via size selectivity effects inside and on the surface of tactoids, enabling unprecedented spatial ...
Dongdong Lin, Massimo Bagnani, Hamed Almohammadi, Ye Yuan, Yufen Zhao, Raffaele Mezzenga   +5 more
wiley   +1 more source

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

Detection of the simplest sugar, glycolaldehyde, in a solar-type protostar with ALMA

, 2012
Glycolaldehyde (HCOCH2OH) is the simplest sugar and an important intermediate in the path toward forming more complex biologically relevant molecules. In this paper we present the first detection of 13 transitions of glycolaldehyde around a solar-type ...
Beltrán, Bottinelli, Butler, Carroll, Cazaux, Ceccarelli, Chandler, Goldsmith, Halfen, Hollis, Hollis, Hollis, Hollis, Horn, Loinard, Requena-Torres, Widicus Weaver, Woods   +17 more
core   +1 more source

The UMIST Database for Astrochemistry 2022

Astronomy & Astrophysics
Context. Detailed astrochemical models are a key component to interpret the observations of interstellar and circumstellar molecules since they allow important physical properties of the gas and its evolutionary history to be deduced. Aims. We update one of the most widely used astrochemical databases to reflect advances in experimental and theoretical
T. J. Millar, C. Walsh, M. Van de Sande, A. J. Markwick   +3 more
openaire   +5 more sources

Full Dimensional Potential Energy Function and Calculation of State-Specific Properties of the CO+N2 Inelastic Processes Within an Open Molecular Science Cloud Perspective

Frontiers in Chemistry, 2019
A full dimensional Potential Energy Surface (PES) of the CO + N2 system has been generated by extending an approach already reported in the literature and applied to N2-N2 (Cappelletti et al., 2008), CO2-CO2 (Bartolomei et al., 2012), and CO2-N2 ...
Andrea Lombardi, Andrea Lombardi, Fernando Pirani, Massimiliano Bartolomei, Cecilia Coletti, Antonio Laganà, Antonio Laganà, Antonio Laganà   +7 more
doaj   +1 more source

Water Vapor in the Inner 25 AU of a Young Disk around a Low-Mass Protostar

, 2010
Water is one of the key molecules in the physical and chemical evolution of star- and planet-forming regions. We here report the first spatially resolved observation of thermal emission of (an isotopologue of) water with the Plateau de Bure ...
Jorgensen, Jes K., van Dishoeck, Ewine F.   +1 more
core   +1 more source