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Auflistung nach Schlagwort "oxygen"

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Ag(I) ions working as a hole-transfer mediator in photoelectrocatalytic water oxidation on WO3 film

Jeon, Tae Hwa; Monllor–Satoca, Damián; Moon, Gun–hee; Kim, Wooyul; Kim, Hyoung–il; Bahnemann, Detlef W.; Park, Hyunwoong; Choi, Wonyong ([London] : Nature Publishing Group UK, 2020)

Ag(I) is commonly employed as an electron scavenger to promote water oxidation. In addition to its straightforward role as an electron acceptor, Ag(I) can also capture holes to generate the high-valent silver species. ...
Effect of oxygen impurities on the critical properties of the (2×2)-2H/Ni(111) order-disorder phase transition

Budde, K.; Schwenger, L.; Voges, C.; Pfnür, Herbert (College Park, MD : American Physical Society, 1995)

Critical behavior of the two-dimensional order-disorder phase transition of the (2×2)-2H structure on Ni(111) was studied by high-resolution low-energy electron-diffraction experiments, both for the pure system and with ...
Elektronische Wechselwirkung zwischen Kohlenmonoxyd und aufgedampften Ge-Filmen mit reiner oder mit Sauerstoff vorbelegter Oberfläche

Suhrmann, R.; Kruel, M.; Wedler, G. (Berlin, Boston : De Gruyter, 1963)

Ge-films are evaporated under high vacuum conditions at 77°K. They are investigated either in the disordered state (before annealing at a higher temperature) or in the ordered state after annealing. The electric resistance ...
Entwicklung eines faseroptischen Chemo- und eines Biosensors und deren Einsatz in der Biotechnologie

Lam, Hung Tuan (Hannover : Universität, 2002)

[no abstract]
Fast dynamics of H2O in hydrous aluminosilicate glasses studied with quasielastic neutron scattering

Indris, Sylvio; Heitjans, Paul; Behrens, Harald; Zorn, Reiner; Frick, Bernhard (College Park, MD : American Physical Society, 2005)

We studied the dynamics of dissolved water in aluminosilicate glasses with the compositions NaAlSi3O8⋅0.3H2O, NaAlSi3O8⋅1.3H2O and Ca0.5AlSi3O8⋅1.3H2O using quasielastic neutron scattering. As shown by near-infrared ...
First-principles theory of surface thermodynamics and kinetics

Stampfl, C.; Kreuzer, H.J.; Payne, S.H.; Pfnür, Herbert; Scheffler, M. (College Park, MD : American Physical Society, 1999)

Understanding the complex behavior of particles at surfaces requires detailed knowledge of both macroscopic and microscopic processes that take place; also certain phenomena depend critically on temperature and gas pressure. ...
Formation of surface color centers at differently coordinated sites: MgO/Ag(1,1,19)

Kramer, J.; Tegenkamp, Christoph; Pfnür, Herbert (College Park, MD : American Physical Society, 2003)

In order to find criteria for discrimination between surface color centers at terraces and steps, and bulk color centers, the characteristic losses of these centers have been investigated by electron energy loss spectroscopy ...
I-Type Cosmic Spherules as Proxy for the Δ′17O of the Atmosphere—A Calibration With Quraternary Air

Fischer, Meike B.; Oeser, Martin; Weyer, Stefan; Folco, Luigi; Peters, Stefan T. M.; Zahnow, Fabian; Pack, Andreas (Hoboken, NJ : Wiley, 2021)

Remnants of shooting stars are preserved in form of cosmic spherules in ice and sediments. The extraterrestrial material is heated and melted upon atmospheric entry and is collected at the Earth's surface as cosmic spherules. ...
Immiscible hydrous Fe-Ca-P melt and the origin of iron oxide-apatite ore deposits

Hou, Tong; Charlier, Bernard; Holtz, Francois; Veksler, Ilya; Zhang, Zhaochong; Thomas, Rainer; Namur, Olivier (London : Springer Nature, 2018)

The origin of iron oxide-apatite deposits is controversial. Silicate liquid immiscibility and separation of an iron-rich melt has been invoked, but Fe-Ca-P-rich and Si-poor melts similar in composition to the ore have never ...
In situ ATR-FTIR study of H2O and D2O adsorption on TiO2 under UV irradiation

Belhadj, Hamza; Hakki, Amer; Robertson, Peter K.J.; Bahnemann, Detlef W. (Cambridge : Royal Society of Chemistry, 2015-08-06)

The adsorption of water and deuterium oxide on TiO2 surfaces was investigated in the dark as well as under UV(A) irradiation using in situ ATR-FTIR spectroscopy under oxygen and oxygen free conditions. Adsorption of H2O–D2O ...
Light intensity dependence of the kinetics of the photocatalytic oxidation of nitrogen(ii) oxide at the surface of TiO2

Dillert, Ralf; Engel, Astrid; Große, Julia; Lindner, Patrick; Bahnemann, Detlef W. (Cambridge : Royal Society of Chemistry, 2013)

Air pollution by nitrogen oxides represents a serious environmental problem in urban areas where numerous sources of these pollutants are concentrated. One approach to reduce the concentration of these air pollutants is ...
Novel CO 2 -tolerant Al-containing membranes for high-temperature oxygen separation

Partovi, Kaveh; Bittner, Michael; Caro, Jürgen (Cambridge : Royal Society of Chemistry, 2015)

Novel dual-phase oxygen-transporting membranes with compositions 40 wt% Nd0.6Sr0.4Al0.2Fe0.8O3−δ–60 wt% Ce0.9Nd0.1O2−δ (NSAF6428–CN91) and 40 wt% Nd0.5Sr0.5Al0.2Fe0.8O3−δ–60 wt% Ce0.8Nd0.2O2−δ (NSAF5528–CN82) were successfully ...
Phase diagram and critical behavior of the adsorption system O/Ru(001): Comparison with lattice-gas models

Piercy, P.; De'Bell, K.; Pfnür, Herbert (College Park, MD : American Physical Society, 1992)

The chemisorption of oxygen on the Ru(001) surface shows ordered p(2×2) and p(1×2) phases at coverages of 1/4 and 1/2 monolayer, respectively, that are observed to undergo apparently continuous transitions to a disordered ...
A portable biosensor for 2,4-dinitrotoluene vapors

Prante, Marc; Ude, Christian; Große, Miriam; Raddatz, Lukas; Krings, Ulrich; John, Gernot; Belkin, Shimshon; Scheper, Thomas (Basel : MDPI AG, 2018)

Buried explosive material, e.g., landmines, represent a severe issue for human safety all over the world. Most explosives consist of environmentally hazardous chemicals like 2,4,6-trinitrotoluene (TNT), carcinogenic ...
Prospect for precision quantum logic spectroscopy of vibrational overtone transitions in molecular oxygen ions

Wolf, Fabian; Heip, Jan C.; Zawierucha, Maximilian J.; Shi, Chunyan; Ospelkaus, Silke; Schmidt, Piet O. ([Bad Honnef] : Dt. Physikalische Ges., 2024)

Precision spectroscopy has been the driving force for progress of our physical understanding and still is a promising tool for the investigation of new physics. Molecules offer transitions which allow tests that are not ...
Structural modifications of quasi-one-dimensional submonolayers by impurity doping

Godzik, G.; Block, T.; Pfnür, Herbert (College Park, MD : American Physical Society, 2004)

In this study, carried out by analysis of intensities and spot profiles in low energy electron diffraction, we investigated the influence of electronegative oxygen atoms as dopants on the long range order, the thermal ...
Studies on the robustness of underwater laser cutting of S355J2+N using a Yb:YAG disk laser source

Leschke, Jan; Barroi, Alexander; Kaierle, Stefan; Hermsdorf, Jörg; Overmeyer, Ludger (Amsterdam : Elsevier B.V., 2016)

In this paper, an underwater laser cutting process for maintenance and replacement operations is presented and investigated regarding process robustness for the application in rough environments. A Yb:YAG laser is used ...
Sulfur degassing at Erta Ale (Ethiopia) and Masaya (Nicaragua) volcanoes: Implications for degassing processes and oxygen fugacities of basaltic systems

De Moor, J.M.; Fischer, T.P.; Sharp, Z.D.; King, P.L.; Wilke, M.; Botcharnikov, Roman E.; Cottrell, E.; Zelenski, M.; Marty, B.; Klimm, K.; Rivard, C.; Ayalew, D.; Ramirez, C.; Kelley, K.A. (Hoboken, NJ : Blackwell Publishing Ltd, 2013)

We investigate the relationship between sulfur and oxygen fugacity at Erta Ale and Masaya volcanoes. Oxygen fugacity was assessed utilizing Fe 3+/ΣFe and major element compositions measured in olivine-hosted melt inclusions ...
Supramolecular structure of the mitochondrial oxidative phosphorylation system

Boekema, Egbert J.; Braun, Hans-Peter (Bethesda, Md. : ASBMB Publications, 2007)

The protein complexes of the mitochondrial oxidative phosphorylation system were recently reported to form supramolecular assemblies termed respiratory supercomplexes or respirasomes. These supercomplexes are considered ...
Traveling interface modulations in the NH 3 + O 2 reaction on a Rh(110) surface

Rafti, M.; Uecker, H.; Lovis, F.; Krupennikova, V.; Imbihl, R. (Cambridge : Royal Society of Chemistry, 2012)

A new type of traveling interface modulation has been observed in the NH 3 + O 2 reaction on a Rh(110) surface. A model is set up which reproduces the effect, which is attributed to diffusional mixing of two spatially ...

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