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Tuesday, April 21, 2020 | History

2 edition of recombination of atomic oxygen found in the catalog.

recombination of atomic oxygen

Lewis Gregory Hogan

recombination of atomic oxygen

  • 155 Want to read
  • 4 Currently reading

Published .
Written in English

    Subjects:
  • Oxygen.

  • Edition Notes

    Statementby Lewis Gregory Hogan.
    The Physical Object
    Pagination[10], 114 leaves, bound :
    Number of Pages114
    ID Numbers
    Open LibraryOL14239543M

    The atomic oxygen ion proved to be less than 1% of the positive ions at the km level; also, using some rate coefficients from ion-chemistry, it turned out that the molecular ions recombine with electrons at a rate which is time faster than that for the atomic oxygen ion.


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recombination of atomic oxygen by Lewis Gregory Hogan Download PDF EPUB FB2

Recombination coefficients for atomic oxygen are plotted on a logarithmic scale as a function of the reciprocal temperature for analysis by the Arrhenius equation: γ = B exp(-Ea/RT) (3) where B is the pre-exponential coefficient, Ea is the activation energy of the oxygen recombination process,File Size: KB.

' RECOMBINATION OF CARBON MONOXIDE AND ATOMIC OXYGEN AT HIGH TEMPERATURES* by Theodore A. Brabbs and Frank E. Belles Lewis Research Center SUMMARY Recombination of carbon monoxide and atomic oxygen was studied in the expansion wave of a single-pulse shock tube at temperatures from ' to ' K and pressures from Cited by: 3.

Atomic oxygen. Atomic oxygen, denoted O(3 P) or O(3P), is very reactive, as the single atoms of oxygen tend to quickly bond with nearby Earth's surface, it does not exist naturally for very long, but in outer space, the presence of plenty of ultraviolet radiation results in a low Earth orbit atmosphere in which 96% of the oxygen occurs in atomic form.

Additional Physical Format: Online version: Costikyan, T.W. Catalytic recombination of hydrogen and oxygen. Oak Ridge, Tenn.: U.S. Atomic Energy Commission. The book is inter.~ed to serve as an in-depth review of work to this date on the subject of recombination of atomic ions both in collision with free electrons and with atoms.

It contains contributions from almost all groups which have made significant contributions in this area during the last decade. A STUDY OF THE RECOMBINATION OF ATOMIC OXYGEN BY MEANS OF THE FLASH SPECTRA OF THE SCHUMANN-RUNGE SYSTEM* J.

GOLDEN and A. MYERSONt General Electric Company, MSVD, Philadelphia, Pennsylvania Abstracthe recombination of atomic oxygen has been studied at temperatures not exceeding several hundred degrees Cited by: 1. In this section, the method used for measurement of the recombination coefficient γ of atomic oxygen on surface is briefly presented.

Optical emission spectroscopy (O.E.S.) and actinometry techniques were used to follow the relative atomic oxygen Cited by: 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. Recombination coefficient of atomic oxygen on silica surfaces at high temperature: Experiment and molecular dynamics simulation Chapter (PDF Available). Another common method for measuring the oxygen recombination coefficient is to measure the spatial [5, 31, 29] or temporal variation [32] in the concentration of.

Catalytic surface recombination of atomic oxygen is studied in a flow system by paramagnetic resonance absorption and a comparison is made with platinum wire detectors for the same conditions of flow.

Recombination of oxygen atoms on a fuzed quartz surface is found to follow first‐order kinetics with a surface recombination efficiency of ×10—5 per by: Abstract The recombination coefficient for the silver-coated surface of an atomic-oxygen detector in the pressure ranger from 50 to Pa was determined.

The coefficient, found to be equal todoes not depend on : D. Bromberg. 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. Understanding Atomic Oxygen Oxygen comes in several different forms. The oxygen that we breathe is called O 2 —that is, it is comprised of two atoms of oxygen.

O 3 is ozone, such as occurs in Earth's upper atmosphere, and O (one atom), is atomic oxygen. Atomic oxygen doesn't exist naturally for very long on the surface of Earth, as it is very.

The ozone–oxygen cycle is the process by which ozone is continually regenerated in Earth's stratosphere, converting ultraviolet radiation (UV) into Sydney Chapman resolved the chemistry involved.

The process is commonly called the Chapman cycle by atmospheric scientists. Most of the ozone production occurs in the tropical upper stratosphere and. Myerson, A.

() Mechanisms of Surface Recombination form Step-Function Flows of Atomic Oxygen over Noble Metals, J. Chem. Phys. 42, No. 9, Cited by: 4. Destructive Power of Atomic Oxygen Used to Restore Artwork: NASA research into the damage to satellites caused by atomic oxygen in low Earth orbit has led to a new way to restore damaged artwork.

Atomic oxygen is an elemental form of. The goal of this work is to model the heterogeneous recombination of atomic oxygen on silica surfaces, which is of interest for accurately predicting the heating on vehicles traveling at hypersonic by: 1.

Abstract. High resolution relative photoionization cross sections are reported for a number of autoionizing states of atomic oxygen, including the metastable 3s'' 3 P 0, and 2s2p 5 3 P 0 states.

The wavelength resolution of the present data ( Å, FWHM) is a factor of 4 better than that of the previously reported data, and is sufficient to allow observation of lifetime broadening for.

Kaplan () proposed that the auroral green line arises if ionized molecular oxygen recombines with electrons, so that atomic oxygen in the 1 S state is formed.

A transition from the 1 S state to a lower state would then give rise to radiation at Å. Using molecular dynamics simulations with the ReaxFF potential, we find that the chemical sites active in oxygen atom recombination on silica surfaces consist of a small number of specific defects.

The individual reactions in our finite rate catalytic model are based on the possible outcomes of oxygen interaction with these by: 4.

The recombination coefficients for diatomic gases range from 2. 5 X 6 cc/ion-sec for hydrogen to x 7 cc/ion-sec for oxygen. At electron temperatures of K, the recombination is found to be independent of pressure for the monatomic gases.

A pres. @article{osti_, title = {Cl atom recombination on silicon oxy-chloride layers deposited on chamber walls in chlorine-oxygen plasmas}, author = {Khare, Rohit and Srivastava, Ashutosh and Donnelly, Vincent M.}, abstractNote = {Chlorine atom recombination coefficients were measured on silicon oxy-chloride surfaces deposited in a chlorine inductively coupled plasma (ICP) with.

recombination in interstellar clouds: on hydrogen-free grains recombination is limited by the low sticking coefficient of hydrogen atoms, while on grains covered by molecular hydrogen the binding energy is reduced so that recombination is limited by. On the other hand, NiO is likely to be capable of promoting the recombination of adsorbed atomic hydrogen atoms: Theoretical calculations indicate that H + H recombination on NiO() is exothermic, with an activation barrier of only about 40 kJ/mol, and NiO is used as a H 2 gas sensor, implying that hydrogen can reversibly adsorb and desorb Cited by: Atomic oxygen synonyms, Atomic oxygen pronunciation, Atomic oxygen translation, English dictionary definition of Atomic oxygen.

Symbol O A nonmetallic element constituting 21 percent of the atmosphere by volume that occurs as a diatomic. The hydroxyl radical, • OH, is the neutral form of the hydroxide ion (OH −).Hydroxyl radicals are highly reactive (easily becoming hydroxy groups) and consequently short-lived; however, they form an important part of radical chemistry.

Most notably hydroxyl radicals are produced from the decomposition of hydroperoxides (ROOH) or, in atmospheric chemistry, by the reaction of CAS Number: The site is secure. The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted by: 5.

thermosphere, forbidden atomic transitions occur which re-lease photons not generally seen in the laboratory such as reaction rate for any related part of the recombination pro-the A and A emissions of atomic oxygen.

cess is not known precisely, it is difficult to determine the reaction rate of the complete recombination process.

Solar. The photodissociation of the major constituent carbon dioxide produces carbon monoxide and atomic oxygen. The recombination of CO and O takes place in the troposphere through catalytic reactions involving the odd-hydrogen species, H, OH and HO 2.

Observational tests confirm the general validity of the odd-hydrogen by:   These oxygen molecules are broken into atoms by the corona discharge during lightning storms or by UV light from the Sun.

Single oxygen atoms cannot exist alone without regrouping back into di-atomic oxygen molecules. During this recombination stage some atoms will regroup into loosely bonded tri-atomic oxygen.5/5(54). Cambridge Core - Atomic Physics, Molecular Physics and Chemical Physics - Dissociative Recombination of Molecular Ions - by Mats LarssonCited by: The main purpose of this work is to calculate the radiative, dielectronic and total recombination of non-hydrogenic elements.

We applied the photoionization codes to investigate the recombination coefficients. We have calculated radiative and dielectronic recombination coefficients of some elements at different temperatures and ionization by: 1.

Recombination with other atomic oxygen atoms, the formation of ozone, or the reaction with diatomic nitrogen does not readily occur because the mean free path is so large that reaction probabilities are extremely low at.

Atomic oxygen. The effects of atomic oxygen (monatomic oxygen) bombardment were originally highlighted with the early shuttle flights, by a visible effect on exposed polymer surfaces such as Kapton, where changes in characteristics due to atomic oxygen were found to cause undesirable temperature excursions in low Earth orbit and shorten the useful lifetime of many spacecraft.

The recombination of oxygen atoms with O 2 has been monitored directly using kinetic absorption spectroscopy in the vacuum ultra-violet. Oxygen atoms were produced by photolysis of O 2 (λ > nm) and the decay observed via the resonance absorption transitions (3 3 S 1 → 2 3 P J) in the region of nm using a vacuum ultra-violet experimental.

Contents Page Foreword Ill Preface IV Acknowledgment V xprocessesandelementaryreactions 1 Neutraloxygenspecies 1 Complexchemicalsystems 1 a File Size: 4MB. "Atomic-hydrogen blown out of the arc by a jet of molecular hydrogen across the arc, forms an intensely hot flame, capable of melting tungsten (m.

This flame obtains its heat from recombination of hydrogen atoms to H 2." "Hydrogen being set free in a chemical reaction is often more reactive than hydrogen gas.". The computed atomic oxygen recombination coefficient, mainly involving atomic adsorption and Eley-Rideal recombination, is small and increases with temperature in the – K range ( Selected Answer: uranium Answers: recombination of oxygen atoms in the atmosphere uranium oxides of nitrogen None of these are correct.

Response Feedback: correct Question 50 10 out of 10 points What is the simplest way to deal with hazardous wastes. Selected Answer: reduce, reuse, and recycle Answers: treatment and disposal Superfund clean-up dump in the.

Atomic spectra Light emitted or absorbed by single atoms contributes only very little to the colours of our surroundings. Neon signs (or other gas discharge tubes) as used for advertising, sodium or mercury vapour lamps show atomic emission; the colours of fireworks are due to it.nescence spectra of the atomic chlorine recombination reactions over bar argon pressure have been resolved and assigned Kinetically, except for the measurement of non-geminate recombination rate constants of chlorine atoms in an earlier study,5 there were no other related studies in the literature.The global pattern of A atomic oxygen emissions ob-served from ISIS-2 (Shepherd); OGO-6 observations of A is that C02 recombination in the atmospheres of Mars and Venus is catalysed by odd hydrogen (H + OH + H02).

The The book concludes with a chapter brie, disappointinglf y (24 pages), on "waves in the upper atmosphere.".