Surface production of negative hydrogen ions
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Abstract:
Experimental data on generation of negative hydrogen ions on cesiated molybdenum surfaces are presented. The following processes are discussed: backscattering of protons and H2+ ions, sputtering of adsorbed hydrogen by cesium ion bombardment, and backscattering of a thermal or superthermal distribution of hydrogen atoms. The data are compared with theoretical calculations. Surface production is an important process in most negative hydrogen ion sources. An example of a negative hydrogen ion gun using hyperthermal hydrogen atoms incident on an external converter is presented.Keywords:
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The syntheses, crystallographic structures, magnetic properties, and theoretical studies of two heptacoordinated molybdenum complexes with N,N′-bis(3,5-di-tert-butyl-2-hydroxyphenyl)-1,2-phenylenediamine (H4N2O2) are reported. A formally molybdenum(VI) complex [Mo(N2O2)Cl2(dmf)] (1) was synthesized by the reaction between [MoO2Cl2(dmf)2] and H4N2O2, whereas the other molybdenum(VI) complex [Mo(N2O2)(HN2O2)] (2) was formed when [MoO2(acac)2] was used as a molybdenum source. Both complexes represent a rare case of the MoVI ion without any multiply bonded terminal ligands. In addition, molecular structures, magnetic measurements, ESR spectroscopy, and density functional theory calculations indicate that complex 2 is the first stable molybdenum(VI) amidophenoxide radical.
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Abstract Die Reaktion des Mo(O)‐Komplexes (I), in dem ein Phosphin über einen der Pheny1‐Substituenten koordiniert ist, mit MoCl 4 (TH F); oder WCl 4 (PPh 3 ) 2 ergibt den homo‐ bzw. heterozweikernigen Komplex (II) und (IV) mit einer Vierfachbindung zwischen beiden Metallen ohne unterstützende Brückenliganden.
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The preparation of acerate molybdenum and its application were stated.The conversion from acerate molybdenum acid into grainiss ammonium tetramolybdate has also been studied.The results have shown that the formation conditions of acerate molybdenum with super fine grain are as follow:(1)Complex between molybdenum and organic acid is needed;(2)pH value is between 1.90~1.95 as well as the application of acerate molybdenum with fine super grain may be used in the preparation of fine molybdenum wires.It is conceivable that fine acerate molybdenum will be extensively used in the future.
Ammonium molybdate
Molybdenum oxide
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Hydrogen purifier
Ammonia production
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Hydrothermal Synthesis
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Abstract Als mögliche Modelle für die Koordination von Mo durch ungesättigte Thiolat‐Jfhioether‐Liganden in dem Mo‐Pterin‐Cofaktor von Molybdänenzymen wurden die Titelkomplexe (III), (Va) und (VI) dargestellt (siehe Schema).
Molybdenum oxide
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Abstract Durch Zugabe von tBuNC zu einer Lösung von (I) erhält man den Komplex (II), der durch Daten des Elektronenund 1 H‐ und ÜC‐NMR‐Spektrums sowie eine Kristallstrukturbestimmung (Raumgruppe I5") P2 1 /c, Z=4) charakterisiert wurde.
Molybdenum oxide
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We conducted experimental studies aimed at determining the purity of hydrogen obtained at the electrolysis installation made by Hydrogen Technologies (Norway) at the pipe plant Centravis Production Ukraine in the city of Nikopol, Ukraine. It was established that the determination of hydrogen purity and the degree of its purification from impurities (nitrogen) in microconcentrations involves two stages of measurements: − research into the presence of nitrogen in the samples of production hydrogen in the microconcentrations of [[N2] 0.001−0.01 % (rough estimate); − research into the presence of nitrogen in the samples of production hydrogen in the microconcentrations of [[N2] 0.001−0.01 % (fine assessment). We determined that the purity of production hydrogen, obtained during research, was 99.9±0.1 %. A given value for purity does not match certification indicators for purity of production hydrogen claimed by the manufacturer to equal 99.9999 %. We analyzed the reasons for the mismatch between the purity of obtained hydrogen and claimed characteristics. A detailed analysis revealed that the possible cause of high nitrogen concentration in hydrogen is the worn piston rings in the stage of compressor pistons, which causes the penetration of nitrogen in microconcentrations into production hydrogen. Piston rings in the compressor's stage were replaced. Repeated studies into purity of production hydrogen indicate that the purity of production hydrogen amounted to 99.99±0.01 %, which corresponds to the hydrogen of grade A.
Piston (optics)
Degree (music)
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