Catalyzed Dissociation of N2 in Microwave Discharges. I

Young, Robert A.; Sharpless, R. L.; Stringham, Roger S.

doi:10.1063/1.1724844

Cited by 44 publications

(16 citation statements)

References 15 publications

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“…3a and 3b show an initial sharp increase with the addition of small amounts of NO, in contrast to the immediate N-atom loss anticipated from the fast N NO reaction. Similar behaviors have been documented by other researchers working with fast flow and/or high power nitrogen discharge systems [23][24][25].…”

Section: B Concentration Estimatessupporting

confidence: 72%

Nitric Oxide Production from Surface Recombination of Oxygen and Nitrogen Atoms

Pejaković¹,

Marschall²,

Duan³

et al. 2008

Journal of Thermophysics and Heat Transfer

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Experimental results are presented that support the surface-catalyzed production of nitric oxide from the recombination of oxygen and nitrogen atoms on quartz. The experiments employ two-photon laser-induced fluorescence detection of atomic oxygen and atomic nitrogen to characterize changes in gas-phase atom concentrations as the ratio of O to N atoms is varied at the opening of a diffusion-tube side-arm reactor. The measurements verify a correlation between decreased O-atom loss and enhanced N-atom loss in N 2 =N=O mixtures. Computational simulations of the side-arm reactor with a multispecies reaction-diffusion model strengthen the case for NO surface formation, reproducing observed changes in O-and N-atom concentration profiles with varying O/N ratios at the side-arm entrance when surface-catalyzed NO production is included in the boundary conditions. Nomenclature c = concentration or molar density, mol m 3 D = diffusion coefficient, m 2 s 1 F = volumetric flow rate, sccm f s;r = branching fraction of reactant s into product r j = diffusive mass flux, kg m 2 s 1 k B = Boltzmann's constant 1:381 10 23 J K 1 L = side-arm length, m M = molar mass, kg mol 1 N Avro = Avogadro's number, 6:022 10 23 mol 1 P = pressure, Pa R = side-arm radius, m R = universal gas constant, 8:314 J mol 1 K 1 r = radial side-arm coordinate, m T = temperature, K v = bulk flow speed, m s 1 v = average thermal speed, m s 1 w = gas-phase production rate, kg m 3 s 1 w w = surface production rate, kg m 2 s 1 x = mole fraction z = axial side-arm coordinate, m = loss probability 1;1 rs = collision integral, m 2 = viscosity, Pa s = mass density, kg m 3 = diffusion velocity, m s 1 ! s = weighting factor, Eq. (4) Subscripts O, O 2 , N, N 2 , NO = species s = species index r = species index or radial direction w = wall z = axial direction

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Section: B Concentration Estimatessupporting

confidence: 72%

Nitric Oxide Production from Surface Recombination of Oxygen and Nitrogen Atoms

Pejaković¹,

Marschall²,

Duan³

et al. 2008

Journal of Thermophysics and Heat Transfer

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“…If reaction (1) is finished, the intensity of NO * radiation is proportional to the actual values of [N] and [O]. As a result of reaction (1) each NO molecule produces one O atom and consumes one N atom. The dependence…”

Section: Reaction Value Referencementioning

confidence: 99%

“…In many studies various authors [1][2][3][4][5] have observed that even a small admixture of oxygen into nitrogen (or inversely, nitrogen into oxygen) changes the dissociation degree of the main gas substantially. In order to obtain a better understanding of this phenomenon it is necessary to know the absolute densities of both N and O.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous measurement of N and O densities in plasma afterglow by means of NO titration

Vašina

Kudrle

Tálský

et al. 2004

Plasma Sources Sci. Technol.

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In this work we describe a method based on NO titration that permits us to measure at the same time the absolute concentrations of N and O atoms in the gas phase. This method is suitable for low concentrations of oxygen atoms. We also discuss the validity of the titration method, especially the influence of the reaction time. It was used to study the influence of O 2 admixture on the degree of dissociation of nitrogen in the afterglow. The results of the NO titration technique were compared with those obtained by means of electron paramagnetic resonance and with the relative values determined from emission of N 2 (B 3 g-A 3 + u).

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“…Many authors [1,2,3,4,5] demonstrated that even a small admixture can dramatically change the dissociation of the gas. This phenomenon is generally supposed to be caused by one or more of the following effects: change of reduced electric field E/N in the discharge, various homogeneous reactions or by decrease of the wall recombination coefficient due to heterogeneous reactions.…”

Section: Introductionmentioning

confidence: 99%