Results 51 to 60 of about 16,662 (218)

Formation rates of complex organics in UV irradiated CH3OH-rich ices I: Experiments [PDF]

, 2009
(Abridged) Gas-phase complex organic molecules are commonly detected in the warm inner regions of protostellar envelopes. Recent models show that photochemistry in ices followed by desorption may explain the observed abundances.
Garrod, R. T., Linnartz, H., Oberg, K. I., van Dishoeck, E. F.   +3 more
core   +1 more source

Radiative decay of a massive particle and the non-thermal process in primordial nucleosynthesis [PDF]

, 2000
We consider the effects on big bang nucleosynthesis (BBN) of the radiative decay of a long-lived massive particle. If high-energy photons are emitted after the BBN epoch ($t \sim 1 - 10^3$ sec), they may change the abundances of the light elements ...
A. D. Dolgov, A. N. Gorbunov, B. D. Fields, B. D. Fields, B. D. Fields, B. E. J. Pagel, B. L. Berman, C. K. Malcom, D. D. Faul, D. H. Lyth, D. K. Duncan, D. Tytler, D.J. Fixsen, E. Holtmann, G. F. Giudice, G. Sigl, J. A. Frieman, J. A. Koepke, J. D. Irish, J. D. Jackson, J. Ellis, J. Geiss, J. K. Webb, J. S. Hagelin, J. S. Hagelin, K. A. Olive, K. Jedamzik, Kazunori Kohri, L. M. Hobbs, M. Cassé, M. H. Reno, M. Kawasaki, M. Kawasaki, M. Kawasaki, M. Kawasaki, M. Lemoine, Masahiro Kawasaki, P. Bonifacio, P. McDonald, R. Cayrel, R. D. Evans, R. Kallosh, R. Pfeiffer, R. Ramaty, R. Ramaty, S. Burles, S. Dimopoulos, S. Dimopoulos, S. Dodelson, S. Hannestad, S. Hannestad, Takeo Moroi, V. V. Smith, V. V. Smith, Y. I. Izotov, Y. I. Izotov, Yu. M. Arkatov   +56 more
core   +2 more sources

Multiscale Perspectives on Perovskite Instability: From Atomistic Deformation to Device Degradation in Perovskite Solar Cells

Advanced Energy Materials, EarlyView.
Multiscale perspectives on how excess charges in soft lead halide perovskites induce operational instability in photovoltaic devices are presented. Localized carriers formed under thermodynamic non‐equilibrium states modify atomistic interactions and drive lattice distortions, accelerating device degradation.
Joo‐Hong Lee, Donghyeon Lee, Seoyoon Lee, Jin‐Wook Lee, Mansoo Choi, Min‐cheol Kim, Namyoung Ahn   +6 more
wiley   +1 more source

Directional Radiation and Photodissociation Regions in Molecular Hydrogen Clouds

, 2008
Some astrophysical observations of molecular hydrogen point to a broadening of the velocity distribution for molecules at excited rotational levels. This effect is observed in both Galactic and high redshift clouds. Analysis of H_2, HD, and CI absorption
A. Dalgarno, A. Ivanchik, A. V. Ivanchik, B. L. Rachford, B. T. Draine, B.D. Savage, C. Ledoux, D. A. Varshalovich, D. A. Varshalovich, D. J. Hollenbach, D. J. Hollenbach, E. B. Jenkins, F. Petit Le, H. Abgrall, H. Abgrall, H. Abgrall, H. Bluhm, J. Ge, J. M. Shull, J. M. Shull, J. Tumlinson, L. J. Spitzer, M. Jura, M. Jura, P. Noterdaeme, P. Noterdaeme, P. Petitjean, R. Srianand, R. Srianand, S. A. Balashev, S. A. Levshakov, S. Lacour, T. P. Stecher   +32 more
core   +2 more sources

Gas Kinematics and Dynamics of Carina Pillars: A Case Study of G287.76-0.87

The Astrophysical Journal
We study the kinematics of a pillar, namely G287.76-0.87, using three rotational lines of ^12 CO(5-4), ^12 CO(8-7), ^12 CO(11-10), and a fine structure line of [O i ] 63 μ m in southern Carina observed by SOFIA/GREAT.
Ngo-Duy Tung, Le Ngoc Tram, Archana Soam, William T. Reach, Edwin Das, Ed Chambers, Blesson Mathew, Heiko Richter   +7 more
doaj   +1 more source

Dynamics and photodissociation region properties in IC 1396A [PDF]

Astronomy & Astrophysics, 2012
Aims. We investigate the gas dynamics and the physical properties of photodissociation regions (PDRs) in IC 1396A, which is an illuminated bright-rimmed globule with internal structures created by young stellar objects. Methods. Our mapping observations of the [C ii] emission in IC 1396A with GREAT onboard SOFIA revealed the detailed velocity structure
Okada, Y., Güsten, R., Requena-Torres, M., Röllig, M., Hartogh, P., Hübers, H., Klein, T., Ricken, O., Simon, R., Stutzki, J.   +9 more
openaire   +2 more sources

Probing the Influence of Sulfur–Aromatic Interactions on the Electronic Structure of Gas‐Phase Peptides

Chemistry – A European Journal, EarlyView.
Just as fingerprints reveal identity, spectroscopic fingerprints reveal molecular secrets. In this article, we show parts of the unique fingerprint of the sulfur–aromatic interaction. By measuring how this force alters the electronic structure of gas‐phase peptides, we provide a fundamental understanding of interactions that give insights into the ...
Laura Pille, Carlos Ortiz‐Mahecha, Bart Oostenrijk, Juliette Leroux, Marion Girod, Konstantin Hirsch, Luke MacAleese, Robert Horst Meißner, Debora Scuderi, Isaak Unger, Vicente Zamudio‐Bayer, Sadia Bari, Lucas Schwob   +12 more
wiley   +1 more source

Radiation Hydrodynamics Simulations of Photoevaporation of Protoplanetary Disks by Ultra Violet Radiation: Metallicity Dependence

, 2018
Protoplanetary disks are thought to have lifetimes of several million years in the solar neighborhood, but recent observations suggest that the disk lifetimes are shorter in a low metallicity environment.
Hosokawa, Takashi, Kuiper, Rolf, Nakatani, Riouhei, Nomura, Hideko, Yoshida, Naoki   +4 more
core   +1 more source

Charge State Influence on Stability and Isomerism in Dehydrogenated PAHs: Insights from Anthracene, Acridine, and Phenazine

ChemPhysChem, Volume 26, Issue 6, March 15, 2025.
The ionization of anthracene, acridine, and phenazine has been explored, along with the removal of one and two hydrogen atoms, to provide valuable information for astrochemists and to understand the behavior of the resulting structures and their electronic reorganization. Abstract In this study, we systematically explored the stability and isomerism of
Khaldia Zghida, Farouk Hamza Reguig, Manuel Alcamí, Al Mokhtar Lamsabhi   +3 more
wiley   +1 more source

Water, O2 and Ice in Molecular Clouds

, 2009
We model the temperature and chemical structure of molecular clouds as a function of depth into the cloud, assuming a cloud of constant density n illuminated by an external FUV (6 eV < E < 13.6 eV) flux G_0 (scaling factor in multiples of the local ...
Aikawa, Andersson, Bensch, Bergin, Bergin, Bergin, Bernard, Bringa, Cesarsky, d'Hendecourt, David Hollenbach, Drapatz, Edwin A. Bergin, Gary J. Melnick, Gianini, Goldsmith, Habing, Hasegawa, Hollenbach, Jensen, Kamegai, Kaufman, Lee, Leger, Melnick, Michael J. Kaufman, Millar, Mumma, Neufeld, Neufeld, Nilsson, Plume, Pontoppidan, Ristorcelli, Rodriguez-Franco, Snell, Spaans, Spitzer, Tielens, Tielens, Whittet, Williams, Öberg, Öberg   +43 more
core   +1 more source