Secondary ion emission of selected transition metals under nitrogen oxides

Brudny, M. M.; Rybczynski, W.; Seidel, W.; Thiel, Dieter

doi:10.1007/bf01244289

Cited by 4 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The different gases can be introduced into the enclosed volume by a gas handling system. The different gases used were natural O 2 , NO, N 2 O, and N 2 as well as O 2 and NO enriched (>95%) in 18 O and 15 N. The reaction of NO and O 2 to N 2 O and NO 2 , as well as the decomposition of N 2 O were also studied, using gas mixtures of both natural and in 18 O and 15 N enriched O 2 and NO. The masses corresponding to the different N 2 O and NO 2 species were measured with time.…”

Section: Methodsmentioning

confidence: 99%

“…The chemical reactions in the system O 2 -NO x has been studied in a conventional furnace. The reaction rates of formation and decomposition of NO x have been measured by monitoring the isotopic concentration in a closed system (conventional furnace) and using isotopical labeled (with 14 N, 15 N, 16 N, 16 O, and 18 O) NO x and O 2 gas mixtures. It was found that O 2 and NO reacted at room temperature to NO 2 and N 2 O.…”

Section: Methodsmentioning

confidence: 99%

“…6). The gas mixture in this figure is 2 mbar NO and 0.2 mbar O 2 and the O 2 pressure was increased to 2 mbar after 2.5 h. The NO 2 formed is mainly from NO, since the main component is 15 16 O) and four NO molecules (for the 15 N) involved, which makes it very likely that the reaction is catalyzed by the surface of the stainless steel. The reaction scheme on the stainless steel surface for producing NO 2 is probably 2NO o NO 2 ϩ N* where N* is some sort of nitrogen (excited, ion, atom, etc.)…”

Section: Reaction In No and O 2 Mixtures-mentioning

confidence: 98%

“…The reaction rates of formation and decomposition of NO x have been measured by monitoring the isotopic concentration in a closed system (conventional furnace) and using isotopical labeled (with 14 N, 15 N, 16 N, 16 The rate of decomposition is described by Eq. 1 despite the fact that the pressures of N 2 , O 2 , and NO increase continuously.…”

Section: Materials Physics Royal Institute Of Technology Se-100 44 mentioning

confidence: 99%

“…10 Iron and chromium are very catalytically active for nitrogen and several adsorbed species have been reported, like NO, NO 2 , N 2 O, N, O, nitrosyl, dinitrosyl, etc. [11][12][13][14][15][16][17][18][19][20][21][22] The adsorption chemistry of pure NO is thereby complex, and adding O 2 to the system will probably increase the complexity. Lowering the O 2 pressure by a factor 10 (a 10 mbar NO and 1 mbar O 2 gas mixture), did not give as large an effect on the reaction rate (Fig.…”

Section: Reactions In Thementioning

confidence: 99%

See 4 more Smart Citations

Reactions in the System O 2 ‐ NO ‐ N 2 O in a Conventional Furnace: II. Chemical Reactions Between O 2 and NO

Åkermark

Ganem

Trimaille

et al. 1999

J. Electrochem. Soc.

View full text Add to dashboard Cite

There are several reactions occurring during the oxidation of samples in a conventional furnace. Many of these reactions can change the gas-phase composition during the experiments. 1,2 As long as the oxidizing gas is pure and fairly stable (for instance O 2 or NO) the main reactions that will occur are various exchange reactions. These reactions have been discussed in Part I of this paper. In gas mixtures there can also be a reaction between the different gas components to form new species. In gas mixtures of O 2 and NO (and N 2 ) various NO x species are formed, where NO x is a collective name for different oxidized nitrogen species, like NO, N 2 O, NO 2 , etc. The formation and the reaction of NO x are essential issues in many fields of science. The combustion of fossil fuel generates NO x , which is a severe environmental problem, and the main source of this pollutant is automobile emissions. There are many ways in which NO x has a negative effect on the environment, such as acting as a greenhouse gas and being responsible for the generation of ozone in photochemical smog. N 2 O is one of the species (though not the worst one) responsible for the ozone hole, etc. 3 Apart from many environmental problems with NO x , there are several technical applications where NO x is a vital gas component. In recent time the computer industry has shown an interest in the chemistry of NO x . We are now reaching the point when the dimensions of the data chips (and thereby their speed) are limited by the performance of the Si-SiO 2 interface. An annealing in NO x in the manufacturing process of data chips seems to give a better performance of the Si-SiO 2 interface, by the formation of a thin oxynitride layer at the Si-SiO 2 interface. 4 In order to understand the oxidation and oxynitration of silicon the reactions of O 2 and NO in the furnace, and especially on SiO 2 , have to be better understood. In the O 2 -NO furnace system there are several chemical reactions between O 2 and NO to N 2 O, NO 2 , and NO x . We have studied some of these reactions in a closed reaction chamber with the use of different isotopes and continuously probed the gas-phase composition with a mass spectrometer. We have especially focused on the formation of N 2 O and NO 2 , and have found that the reaction path is not as expected. 5 ExperimentalExchange reactions and chemical reactions of the O 2 -NO system have been studied by in situ probing of the gas-phase composition of a closed vacuum furnace system with a mass spectrometer. The amounts of the different gas components (chemical and isotopic components) can be calculated from the measured total pressure and composition. The reactions rates can thereby be evaluated from the time dependency of the amounts of reactants and reaction products. The vacuum furnace system used (see Fig. 1 of the preceding paper on p. 4566) consists of four main parts: an introduction chamber, a mass spectrometer, a gas-handling system, and a reaction chamber, The reaction chamber consists of a part where the walls are s...

show abstract