Recombination Of Nitrogen Atoms Research Articles

Emission of delayed luminescence after reaction of active nitrogen with mixed aromatic polycrystals at 77 K. Evidence for an active nitrogen induced chemi-ionization

Weak ‘delayed’ luminescence is emitted after the reaction of active nitrogen with mixed host–guest aromatic polycrystals at 77 K. A spectroscopic investigation of this delayed luminescence shows that: (i) the spectrum of the delayed luminescence agrees with the guest phosphorescence spectrum and (ii) trapped electrons are created during the initial gas–solid reaction of active nitrogen with the cold hydrocarbon surface. This active nitrogen induced chemi-ionization is suggested to occur via the two-body recombination of nitrogen atoms N(4S) on the cold surface. This study completes previous e.s.r. and optical investigations of the same systems during the reaction of active nitrogen.

Internal Energy of Heterogeneous Reaction Products: Nitrogen-Atom Recombination on Iron

Internal Energy of Heterogeneous Reaction Products: Nitrogen-Atom Recombination on Iron

CN emission in the reaction of active nitrogen with methanol

The chemiluminescence from the CN radical in the reaction of active nitrogen with methanol has been studied from 296 to 438 K. The effects of various quenchers and the kinetic behaviour of the chemiluminescence indicate that it is excited by nitrogen atom recombination rather than energy transfer from N2(A3∑+u). The concentration of the organic precursor to the emission is controlled by a different reaction which is probably bimolecular. The excited CN radicals are formed in the reaction N + CH → CN(B2∑+)+ H.

On the recombination mechanism of atomic nitrogen near a catalytic surface in a stream of dissociated air

It is shown that the heterogeneous recombination of nitrogen atoms on a catalytically active surface in a stream of dissociated air is accompanied by intense gas-phase recombination of the nitrogen in exchange reactions whose rate is determined by the rate of heterogeneous recombination of atomic oxygen.

Ultraviolet Night Airglow of Venus

The night airglow spectrum of Venus in the ultraviolet is dominated by the v' = 0 progressions of the gamma and delta bands of nitric oxide. The bands are produced by two-body radiative recombination of nitrogen and oxygen atoms. Since the source of these atoms is in the dayside thermosphere, the night airglow is a tracer of the day-to-night thermospheric circulation. The airglow is brightest at equatorial latitudes, and at longitudes on the morning side of the antisolar meridian.

Rate of recombination of nitrogen atoms

Decays of the concentration of N(4S) atoms in the Lewis–Rayleigh nitrogen afterglow were measured in a static mode, with a mass spectrometer that was calibrated against NO titration. The rate constant for recombination of N(4S) atoms with N2 molecules as the third body [N(4S)+N(4S)+N2→N2+N2] was determined as 7.2×10−33 cm6 molecule−2 sec−1. This value is compared with the values obtained by previous investigators. The rate constant for the wall recombination process is also given.

Experimental evidence for a Langmuir-Rideal mechanism in nitrogen atom recombination on glass

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental evidence for a Langmuir-Rideal mechanism in nitrogen atom recombination on glassM. E. Shuman and W. BrennenCite this: J. Phys. Chem. 1979, 83, 4, 492–497Publication Date (Print):February 1, 1979Publication History Published online1 May 2002Published inissue 1 February 1979https://doi.org/10.1021/j100467a013RIGHTS & PERMISSIONSArticle Views26Altmetric-Citations1LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (774 KB) Get e-Alerts

Heterogeneous recombination of nitrogen atoms by the Smith side tube method: Effects of tube length and homogeneous recombination

An apparent pressure dependence of the derived catalytic activity of Pyrex for recombination of nitrogen atoms was observed in a series of Smith side tube experiments. The pressure dependence is shown to arise from an improper application of the infinite cylinder approximation. The effect of homogeneous recombination on the modeling of Smith side tube experiments is explored numerically.

Gas-phase spectra of the radiative recombination of nitrogen atoms at helium temperatures

The lowering of temperature from ≈ 300 K to ≈ 10 K caused drastic changes in the spectral composition of the recombinational afterglow of N atoms: the glow due to the B 3Π gν″ | A 3Σ + uν″ transition with ν′ = 12-9 (λ ≈ 580 nm and λ ≈ 540 nm) disappeared whereas levels with ν′ = 8-5 (λ ≈ 560 nm) appeared. This effect is exlained in terms of Campbell and Thrush's recombination luminescence model (emitting B 3H g state populated by radiationless transition from the lower A 3Σ + u state of the N 2 molecule).

Kinetics of nitrogen atom recombination. An undergraduate physical chemistry experiment

A study of the kinetics of recombination of nitrogen (N4S) atoms in which the concentration-time relations are determined directly by utilizing visual observations of emissions to make gas phase ti...

Surface catalytic efficiency of a sputtered molybdenum layer on quartz and Pyrex for the recombination of nitrogen atoms

The temporal properties of the number density of nitrogen atoms were studied during the decay period of plasmas produced in nitrogen by measuring the intensity of the first positive bands during this period. From the analysis of these data the value of the surface catalytic efficiency γ of a sputtered molybdenum layer on quartz and Pyrex for the recombination of nitrogen atoms was determined for gas pressures varying from 0.1 to 5 Torr and gas temperatures in the range 85–500 °K. A theoretical model explaining the data was derived.

Some observations on the decay of the Lewis-Rayleigh afterglow in a nitrogen-oxygen mixture

The effect of traces of oxygen on the recombination of nitrogen atoms is examined, free from further excitation, in the afterglow observed to follow a discharge in nitrogen. Processes occurring in the volume of the gas and at the wall are discussed quantitatively, and their importance assessed.

Population of N2 (B 3Πg) by N2 (A3Σu+) during the nitrogen afterglow

The time dependence of the intensity of various emission bands during the decay period of plasmas produced in pure nitrogen was measured using the stationary afterglow method. Two processes involving the N2 (A3Σu+) metastable molecule were found to populate the N2 (B 3Πg) state during the nitrogen afterglow. The first process is the energy pooling reaction N2 (A3Σu+)+ N2 (A3Σu+) → N2 (B3Πg)+N2 (X1Σg+), which also populates the N2 (C 3Πu) and N2 (C′3Πu) states. An approximate value for the reaction rate constant for this process was found to be (1.1−0.5+2)× 10−9 cm3 sec−1 per molecule. Strong evidence was found that N2 (B 3Πg) is also populated by the reaction N2 (A3Σu+)+N2* (X)→N2 (A3Σu+, v′>7)+N2(X)→ N2 (B3Πg)+N2 (X), where N2* (X) is a vibrationally excited ground state nitrogen molecule. The population of the N2 (B 3Πg) energy state by recombination of nitrogen atoms was also observed.

Vacuum ultraviolet emission by active nitrogen. I. The formation and removal of N2(a1Πg)

The emission of the Lyman-Birge-Hopfield bands of N2(a1Πg) - X1∑g+),v' ≤ 6 in active nitrogen is shown to originate from the recombination of ground state nitrogen atoms. Two parallel processes occur: (а) A two-body inverse predissociation populates rotational levelsJ> 13 of N2(a1Πg),v' = 6, from which there is rapid rotational and vibrational relaxation; this gives an emission intensity proportional to [N]2. (b) The reaction N(4S) + N2(B3Πg) = N2(a1Πg) + N(4S) (5) populates mainly lower levels of the a a1Πgstate giving emission proportional to [N]3which is enhanced by argon carriers. Some measurements on N2(a'1∑u-),v' = 0 are also reported.

The influence of metastable atoms and molecules on the re-ignition of high-frequency discharges

The high-frequency, electrodeless, breakdown voltage of a gas is reduced during the period immediately following a discharge. The variation of this reduction with afterglow duration has been measured. Discharges were produced with a capacitatively coupled 15 MHz transmitter, in hydrogen, neon and nitrogen gases in the pressure range 0·8-6 mm Hg, and with afterglow durations in the range 2-140 ms.The results in Ne and N2 are shown to be consistent with the slow reduction in the densities of metastable molecules in the afterglow, brought about by their diffusion to the walls of the discharge tube and subsequent deactivation. In N2, it is further argued that metastable molecules are created in the afterglow by nitrogen atom recombination. This view is supported by the observation of the decay of the intensity of visible radiation in the afterglow.From the time and pressure dependence of the reductions in breakdown field, the diffusion coefficients of metastable Ne atoms in Ne and metastable N2 molecules in N2 were found to be 159±13 cm2 s−1 and 71·3±5·9 cm2 s−1 at 1 mm Hg respectively.No reductions in breakdown field beyond those expected from variations in electron diffusion coefficients were observed in hydrogen, owing to the absence of any sufficiently long-lived metastable hydrogen molecules.Finally, the ratio of the rate of ionization per electron for electron ionizing collisions with excited atoms and molecules to that with atoms and molecules in their ground state has been deduced, and is shown to be greater than unity for short afterglow times.

N2 formation in the Lewis-Rayleigh afterglow

The nitrogen atom recombination was studied in the slow decaying Lewis-Rayleigh afterglow in a 220 m3 reaction vessel at total pressures between 0.5 and 500 mTorr. The kinetics of formation and depletion of N2(B3Πg) and (a1Πg) were investigated in detail.Molecule formation by preassociation into levels (B3Πg,v′= 13,J′) and (a1Πg,v′= 6,J′ > 13) above the dissociation limit involving 5∑+g as intermediary was found. Absolute rate constants of 1.6 × 10–19 and 1.8 × 10–21 cm3 molecule–1 s–1 for the radiative recombination via the transitions N2(B3Πg,v′= 13,J′→A3∑+u,v″,J″) and N2(a1Πg,v′= 6,J′ > 13 →X1∑+g,v″J″), respectively, were measured.Molecular states B3Πg, v′⩽ 12 below the dissociation limit are populated by collision-induced processes resulting in characteristic primary vibrational distributions dependent on the nature of the third body. Measurements of the three-body recombination in pure nitrogen yielded a rate constant of 2.4 × 10–33 cm6 molecule–2 s–1 for the recombination via the top B3Πg,v′= 9–12 vibrational levels, and a rate constant of about 1 × 10–32 cm6 molecule–2 s–1 for the total chemiluminescence from the B3Πg state.Vibrational relaxation influences the distribution in B3Πg only at pressures above 1 Torr whereas in a1Πg, relaxation is observed above 50 mTorr.

Nitrogen afterglow and the rate of recombination of nitrogen atoms in the presence of nitrogen, argon, and helium

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitrogen afterglow and the rate of recombination of nitrogen atoms in the presence of nitrogen, argon, and heliumW. Brennen and Edward C. ShaneCite this: J. Phys. Chem. 1971, 75, 10, 1552–1564Publication Date (Print):May 1, 1971Publication History Published online1 May 2002Published inissue 1 May 1971https://doi.org/10.1021/j100680a029RIGHTS & PERMISSIONSArticle Views206Altmetric-Citations44LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (1 MB) Get e-Alerts

Recombination of atoms at surfaces. Part 12.—Nitrogen atoms at some metal and alloy surfaces

The recombination coefficients for the recombination of nitrogen atoms on the surface of a number of metals and alloys have been measured using Smith's side-arm method. The constancy of activity for palladium, silver and a 50/50 alloys shows that d-band vacancies are unimportant. The results for Fe, Ni, Cu and Ni/Cu alloys suggest that with these materials a surface nitrate is formed and its properties are important in controlling the activity.

Recombination of atoms at surfaces. Part 10.—Nitrogen atoms at pyrex surfaces

Smith's side-arm method and Rayleigh's afterglow method have been employed to study the recombination of nitrogen atoms at Pyrex surfaces. The recombination process is predominantly first order at about 0.1 mmHg pressure. At high pressures a higher-order process contributes towards the recombination reaction on Pyrex. The discussion of these results in relation to those obtained by other workers has led to the conclusion that the recombination reaction is a mixture of first- and second-order processes. The value of γN for Pyrex was 6 ± 3 × 10–6.

Recombination of atoms at surfaces. Part 11.—Nitrogen atoms at some acid, base and salt surfaces

The Rayleigh method has been used to investigate the effect on the recombination of nitrogen atoms of treating Pyrex with materials such as H3PO4, NaOH, NaCl, Al(OH)3 etc. The significance of some of these in relation to the mechanism of the process occurring at a Pyrex surface has been discussed. Phosphoric and sulphuric acids lower the activity and the process becomes second order. Aluminium hydroxide increases the activity considerably.