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Context. The origin of the heating of the solar atmosphere is still an unsolved problem. As the photosphere and chromosphere radiate more energy than the solar corona, it is challenging but important to reveal all the mechanisms that…

Solar and Stellar Astrophysics · Physics 2021-08-25 R. Niedziela , K. Murawski , S. Poedts

A model of Lyman limit QSO absorption systems is investigated where they are produced in gaseous galactic halos with a two-phase structure: a hot phase at the halo virial temperature in approximate pressure equilibrium, and a cold,…

Astrophysics · Physics 2009-10-28 H. J. Mo , J. Miralda-Escude

Transparent conducting oxides (TCOs) are essential for the optoelectronics industry, but there is a critical gap in cost-effective methods to rapidly deposit low sheet resistance, high transmittance films without damaging delicate…

Understanding the atomic mechanism of low-temperature CO oxidation on a heterogeneous catalyst is challenging. We performed density functional theory (DFT) calculations to identify the surface structure and reaction mechanism responsible…

Chemical Physics · Physics 2019-05-08 Yongeseon Kim , Hosik Lee , Ja Hun Kwak

The addition of small amounts of $H_2$ were investigated in a DC glow discharge in $N_2$, at low pressure (~1 mbar) and low power (0.05 to 0.2 $W.cm^{-3}$). We quantified the electric field, the electron density, the ammonia production and…

Plasma dynamics critically depends on density and temperature, thus well-controlled experimental realizations are essential benchmarks for theoretical models. The formation of an ultracold plasma can be triggered by ionizing a tunable…

A possible formation mechanism of hydrogen molecules on a galactic scale is examined. We are interested especially in the role of hydrogen molecules for formation and evolution of primordial galaxies. Then, formation process of hydrogen…

Astrophysics · Physics 2015-06-24 Hideyuki Kamaya , Hiroyuki Hirashita

Self-organized patterns (SOP) in plasma discharges arise from the complex interplay of electric field, reactive species and charged particles, driven by non-linear plasma dynamics. While studies have explored SOP formation in various…

Plasma Physics · Physics 2025-04-22 Thierry Dufour , Elliot Ogden

H2 formation in metal-free gas occurs via the intermediate H- or H2+ ions. Destruction of these ions by photodissociation therefore serves to suppress H2 formation. In this paper, I highlight the fact that several processes that occur in…

Astrophysics · Physics 2008-11-26 S. C. O. Glover

We present results from numerical simulations of the cooling-core cluster A2199 produced by the two-dimensional (2-D) resistive magnetohydrodynamics (MHD) code MACH2. In our simulations we explore the effect of anisotropic thermal…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 Ioannis G. Mikellides , Konstantinos Tassis , Harold W. Yorke

A two-electron temperature plasma is produced by the method of diffusion of two different plasmas with distinct temperatures and densities. The method is simple and provides an adequate control over the plasma parameters. The study reveals…

Plasma Physics · Physics 2022-03-02 G. Sharma , K. Deka , R. Paul , S. Adhikari , R. Moulick , S. S. Kausik , B. K. Saikia

In the present work, a batch and continuous production of plasma-activated water (PAW) is reported. To produce PAW in a batch and continuous manner a multiple plasma device setup is used. The multiple plasma device consists of a series of…

Plasma Physics · Physics 2023-01-13 Vikas Rathore , Chirayu Patil , Sudhir Kumar Nema

Cold atmospheric plasma treatments have been applied on lenses seeds and shoots to improve their germination and vigor rates. Two approaches have been considered: direct plasma exposure and plasma activation of liquids (tap water,…

Other Quantitative Biology · Quantitative Biology 2018-02-27 T. Dufour , S. Zhang , S. Simon , A. Rousseau

Ganymede's atmosphere is produced by charged particle sputtering and sublimation of its icy surface. Previous far-ultraviolet observations of the O{\small I\,}1356-{\AA} and O{\small I\,}1304-{\AA} oxygen emissions were used to infer…

Plasma processing using a mixture of noble gas and oxygen is a technique that is currently being used to reduce field emission and multipacting in accelerating cavities. Plasma is created inside the cavity when the gas mixture is exposed to…

Plasma Physics · Physics 2023-06-21 N. K. Raut , T. Ganey , P. Dhakal , T. Powers

We have mapped the warm molecular gas traced by the H_2 S(0) - H_2 S(5) pure rotational mid-infrared emission lines over a radial strip across the nucleus and disk of M51 (NGC 5194) using the Infrared Spectrograph (IRS) on the Spitzer Space…

Astrophysics · Physics 2009-11-13 G. Brunner , K. Sheth , L. Armus , M. Wolfire , S. Vogel , E. Schinnerer , G. Helou , R. Dufour , J. Smith , D. Dale

The physical origin of high velocity cool gas seen in galactic winds remains unknown. Following Wang (1995), we argue that radiative cooling in initially hot thermally-driven outflows can produce fast neutral atomic and photoionized cool…

Astrophysics of Galaxies · Physics 2015-12-16 Todd A. Thompson , Eliot Quataert , Dong Zhang , David Weinberg

Even though water is the main constituent in interstellar icy mantles, its chemical origin is not well understood. Three different formation routes have been proposed following hydrogenation of O, O2, or O3, but experimental evidence is…

Astrophysics · Physics 2009-11-13 S. Ioppolo , H. M. Cuppen , C. Romanzin , E. F. van Dishoeck , H. Linnartz

The formation of stable products of water decomposition under laser exposure of aqueous colloidal solutions of nanoparticles is experimentally studied. Laser exposure of colloidal solutions leads to formation of H2, O2, and H2O2. The…

Chemical Physics · Physics 2017-07-14 E. V. Barmina , S. V. Gudkov , A. V. Simakin , G. A. Shafeev

The effect of doping with hydrogen on the electrical properties of vanadium oxide is studied. For vanadium oxide films, subject to cold hydrogen plasma treatment, the temperature dependence of resistance with a maximum at T ~ 100 K is…

Superconductivity · Physics 2008-12-17 Alex Pergament , Nik Kuldin
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