Results 81 to 90 of about 35,251 (238)

Can neutral and ionized PAHs be carriers of the UV extinction bump and the diffuse interstellar bands?

, 2011
Up to now, no laboratory-based study has investigated polycyclic aromatic hydrocarbon (PAH) species as potential carriers of both the diffuse interstellar bands (DIBs) and the 2175 A UV bump.
Bouwman, Clayton, Draine, Ehrenfreund, F. Huisken, Frisch, Galazutdinov, J. Bouwman, Jenniskens, Kokkin, Léger, Léger, M. Steglich, Pino, Radzig, Salama, Salama, Sassara, Schnaiter, Schnaiter, Searles, Steglich, Steglich, Th. Henning, Troy   +24 more
core   +1 more source

Beyond scaleup: Knowledge‐aware parsimony learning from deep networks

AI Magazine, Volume 46, Issue 1, Spring 2025.
Abstract The brute‐force scaleup of training datasets, learnable parameters and computation power, has become a prevalent strategy for developing more robust learning models. However, due to bottlenecks in data, computation, and trust, the sustainability of this strategy is a serious concern.
Quanming Yao, Yongqi Zhang, Yaqing Wang, Nan Yin, James Kwok, Qiang Yang   +5 more
wiley   +1 more source

Formation of All Three C2H4O Isomers—Ethylene Oxide (c-C2H4O), Acetaldehyde (CH3CHO), and Vinyl Alcohol (CH2CHOH)—in Ethanol-containing Interstellar Analog Ices

The Astrophysical Journal
Oxygen-containing complex organic molecules are key precursors to biorelevant compounds fundamental for the origins of life. However, the untangling of their interstellar formation mechanisms has just scratched the surface, especially for oxygen ...
Jia Wang, Chaojiang Zhang, Joshua H. Marks, Ralf I. Kaiser   +3 more
doaj   +1 more source

Microwave Evidence For Interstellar Molecules [PDF]

Highlights of Astronomy, 1971
Some time ago, optical astronomy was successful in detecting the first molecular species in interstellar space. However, these have been limited to the three diatomic molecules CH, CH+, and CN. Consideration of this list made it rather natural, after the development of microwave astronomy, for some attention to be given to a search for OH, which has a ...
openaire   +2 more sources

The Role of Polycyclic Aromatic Hydrocarbons in Ultraviolet Extinction. I. Probing small molecular PAHs

, 2003
We have obtained new STIS/HST spectra to search for structure in the ultraviolet interstellar extinction curve, with particular emphasis on a search for absorption features produced by polycyclic aromatic hydrocarbons (PAHs).
A. N. Witt, Allain T., Allain T., Allamandola L. J., Allamandola L. J., Boulanger F., D. C. B. Whittet, Duley W. W., F. Salama, Geoffrey C. Clayton, Karl D. Gordon, L. J. Allamandola, Leitherer C., Li A., Mattila K., Michael J. Wolff, Onaka T., Peter G. Martin, Schutte W. A., Smith R. G., T. P. Snow   +20 more
core   +1 more source

Matrix isolation as a tool for studying interstellar chemical reactions [PDF]

Since the identification of the OH radical as an interstellar species, over 50 molecular species were identified as interstellar denizens. While identification of new species appears straightforward, an explanation for their mechanisms of formation is ...
Ball, David W., Hauge, Robert H., Margrave, John L., Ortman, Bryan J.   +3 more
core   +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

Quantum mechanical modeling of interstellar molecules on cosmic dusts: H₂O, NH₃, and CO₂. [PDF]

Front Chem, 2022
Li F, Quan D, Zhang X, Li X, Esimbek J.
europepmc   +1 more source

The effect of grain size distribution on H$_2$ formation rate in the interstellar medium

, 2005
The formation of molecular hydrogen in the interstellar medium takes place on the surfaces of dust grains. Hydrogen molecules play a role in gas-phase reactions that produce other molecules, some of which serve as coolants during gravitational collapse ...
Aronowitz, Azi Lipshtat, Biham, Biham, Biham, Brown, Caselli, Caselli, Cazaux, Cazaux, Charnley, d'Hendecourt, Draine, Duley, Gould, Green, Hartquist, Hasegawa, Hollenbach, Hollenbach, Hollenbach, Katz, Lipshtat, Mathis, Montroll, Ofer Biham, Pickles, Pirronello, Pirronello, Pirronello, Pirronello, Roser, Sandford, Shalabiea, Smoluchowski, Smoluchowski, Stantcheva, Weingartner, Willacy, Williams   +39 more
core   +1 more source

On the Origin of Infrared Bands Attributed to Tryptophan in Spitzer Observations of IC 348

The Astrophysical Journal Letters
Infrared emission features toward interstellar gas of the IC 348 star cluster in Perseus have been recently proposed to originate from the amino acid tryptophan.
Aditya Dhariwal, Thomas H. Speak, Linshan Zeng, Amirhossein Rashidi, Brendan Moore, Olivier Berné, Anthony J. Remijan, Ilane Schroetter, Brett A. McGuire, Víctor M. Rivilla, Arnaud Belloche, Jes K. Jørgensen, Pavle Djuricanin, Takamasa Momose, Ilsa R. Cooke   +14 more
doaj   +1 more source