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2 edition of Characterization of the ion species in hydrogen and deuterium discharges. found in the catalog.

Characterization of the ion species in hydrogen and deuterium discharges.

Alwyn Anthony Mullan

Characterization of the ion species in hydrogen and deuterium discharges.

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Published by The Author] in [S.l .
Written in English


Edition Notes

Thesis (D. Phil. ) - University of Ulster, 1992.

The Physical Object
Pagination137p. :
Number of Pages137
ID Numbers
Open LibraryOL21161755M

Hydrogen is unique in that it has three isotopes which are named. Deuterium is one of the isotopes of hydrogen. It has one proton and one neutron.. In contrast, the most common isotope of hydrogen, protium, has one proton and no amstrad.fune deuterium contains a neutron, it is more massive or heavier than protium, so it is sometimes called heavy hydrogen. This is called hydrogen bond. This statement is from Linus Pauling () in his book The Nature of the Chemical Bond. He gave the ion [F:H:F]-as an example. At that time, the hydrogen bond was recognized as mainly ionic in nature. The energy associated with hydrogen bond is 8 to 40 kJ/mol. Lithium is the lightest alkali metal and it is highly chemically reactive with relevant ion species in fusion plasmas including hydrogen, deuterium, tritium, carbon, and oxygen. Because of the reactive properties, lithium can provide strong pumping for those ions. It was indeed a spectacular success in TFTR where a very small amount (~ Jan 12,  · Thus, hydrogen/deuterium (H/D) exchange was applied to HPLC-HRMS/MS to confirm the actual chemical structure of the new oligomeric proanthocyanidins. The comparison of the results in water and deuterium oxide and between wine and cranberry extract indicates that the cyclic B-type tetrameric proanthocyanidin is the actual constituent of the Cited by: 7.

Deuterium labeling is utilized to introduce specific information of isotopically labeled atoms which are not present at high abundance in crude oil and allow unambiguous differentiation of the nonpolar sulfur species formed from CD 3 or C 2 D 5 from the original crude oil in positive ESI. Using the labeling procedure also allows to fully Cited by: 9.


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Characterization of the ion species in hydrogen and deuterium discharges. by Alwyn Anthony Mullan Download PDF EPUB FB2

Aug 13,  · In order to discuss the physics mechanism of difference in ion heat transport between hydrogen and deuterium plasmas, typically two shots with the same line-averaged density of m −3 and the same ion heating power of 3 MW are compared, which means that the plasma parameters are as similar as possible and the electron heat transport is decoupled with the ion heat amstrad.fun by: 3.

gyrokinetic simulations. Experimental measurements for comparable hydrogen and deuterium discharges show that the particle confinement time increases by 40% for the heavier isotope species.

The isotope effect on particle flux is reproduced in global and local gyrokinetic amstrad.fun by: 7. 76 Nuclear Instruments and Methods in Physics Research B7/8 () North-Holland, Amsterdam CHARACTERIZATION OF ION IMPLANTED DEUTERIUM TRAPS IN NICKEL BY EQUILIBRATION WITH DEUTERIUM GAS * W.R.

WAMPLER and S.M. Cited by: Over the whole data set, the energy confinement time of deuterium is statistically 10%–20% larger than in hydrogen indicating that the ‘isotope effect’ also exists in non-axisymmetric devices.

Both the electron and ion temperature are elevated in deuterium compared to hydrogen at the same effective absorbed power and amstrad.fun by: 4.

An ion species model – isotope effects. In the absence of molecular ion dissociation, the proton (deuteron) fractions in discharges. with 0, 15 and 32 gauss filters are almost the same when plotted as a function of the.

ionization probability, K. The slight differences arise from gas heating effects. The use of heavy ion activation as a method for the analysis of hydrogen and deuterium has been evaluated.

Thick target yields from reactions of 7 Li, 10 B, 11 B and 19 F on 1 H and 2 H have been determined; activation curves for many of these reactions are presented and interferences are amstrad.fun by: Moving on to consider the incidence of deuterium atoms with θ= =45°, we found the two processes occurring in the case of hydrogen atoms, ion backscattering and atomic adsorption, have the probabilities reported in Fig.

5(a). A comparison with the results Author: Maria Rutigliano, Amedeo Palma, Nico Sanna. The chemical composition of a low-pressure hydrogen dc plasma produced in a hollow cathode discharge has been measured and modeled.

The concentrations of H atoms and of H+, H2+ and H3+ ions were determined with a combination of optical spectroscopic and mass spectrometric techniques, over the range of pressures (p ∼− mbar) amstrad.fun by: Characterization of the Lipoxygenases in Some Olive Cultivars and Determination of Their Role in Volatile Compounds Formation Making Bacteria Behave: New Agonists and Antagonists of Quorum Sensing Reversible O–O Bond Scission of Peroxodiiron(III) to High-Spin Oxodiiron(IV) in Dioxygen Activation of a Diiron Center with a Bis-tpa Dinucleating.

Studies of ICRF discharge conditioning (ICRF-DC) on ASDEX upgrade, JET and TEXTOR coupling the RF power in the FW-IBW mode conversion scenario in plasmas with two ion species. The first.

Hydrogen (deuterium) distribution that occurred during electrochemical and chemical charging in a high purity single aluminum crystal (grown in [1 1 0] direction) was studied, using Secondary Ion. ICWC-plasma and antenna coupling characterization results obtained during the Ion Cyclotron Resonance Frequency (ICRF)-Wall Conditioning experiments performed in helium-hydrogen mixture in AUG and helium-deuterium mixtures in JET are presented here.

Safe operational regimes for optimum ICWC in ITER could be explored for different magnetic amstrad.fun by: 5. The generation of triatomic H 3 + and D 3 + ions in a reflex hollow-cathode discharge using hydrogen and deuterium as the working gas, over a wide range of operating pressure, discharge current and magnetic field strength was explored.

The fractional ion species composition of the extracted ion beam was monitored using a time-of-flight amstrad.fun by: 1.

QUDeX-MS: hydrogen/deuterium exchange calculation for mass spectra with resolved isotopic fine structure Joseph P Salisbury, Qian Liu, and Jeffrey N Agar Departments of Chemistry and Chemical Biology and Pharmaceutical Sciences and Barnett Institute of Chemical and Biological Analysis, Northeastern University, Huntington Avenue, Boston Cited by: 6.

Plasma mass-charge composition of a vacuum arc with deuterium saturated zirconium cathode Article in Technical Physics Letters 40(12) · December with 28 Reads How we measure 'reads'.

Structure characterization of flavonoidO-diglycosides by positive and negative nano-electrospray ionization ion trap mass spectrometry. Journal of Mass Spectrometry36 (11), DOI: /jms Dudley Williams, Shiuan Chen, Mary K. amstrad.fun by: Hydrogen as it occurs in nature is predominantly composed of atoms in which the nucleus is a single proton.

In addition, terrestrial hydrogen contains about % of deuterium atoms in which the nucleus also contains a neutron, and this is the reason for its variable atomic weight (p. 17). 1 ELECTRON CYCLOTRON RESONANCE DISCHARGE AS A SOURCE FOR HYDROGEN AND DEUTERIUM IONS PRODUCTION amstrad.fun Velasco1 and amstrad.fun-Jabon 2 1Universidad de Pamplona, Pamplona, Colombia [email protected] Characterization of deuterium retention and co-deposition of fuel with lithium on the divertor tile of EAST using laser induced breakdown spectroscopy Article in Journal of Nuclear Materials beam targets.

The RF-induction discharge method provides high plasma density for high ion output current, high atomic species from molecular gases, such as hydrogen, deuterium and tritium, long life operation with stable operation characteristics and versatility for various discharge chamber geometries enabling development of devices of diverse.

Characterization of the deuterium recycling flux in front of a graphite surface in the TEXTOR tokamak Article (PDF Available) in Plasma Physics and Controlled Fusion 47(4) · April The helium hydride ion or hydridohelium ion is a cation with chemical formula HeH+.

It consists of a helium atom bonded to a hydrogen atom, with one electron removed. It can also be viewed as protonated helium.

It is the lightest heteronuclear ion, and is believed to be one of the first compounds formed in the Universe after the Big Bang. The ion was first produced in a laboratory in Conjugate base: Helium. discharge can be understood in terms of a simple model.

The isotope effect on molecular processes is also discussed. with both hydrogen and deuterium gas have been 1. Introduction Negative ion based, neutral beam heating of nuclear fusion plasmas requires the production of intense beams of negative deuterium ions. In extracting nega.

Absolute Quantification of Deuterium Ion Fluxes from an ECR Plasma Source Plasma discharges are widely used in technical processes such as surface modification and thin-film deposition and etching. In this sense, the corresponding quantitative characterization of plasma sources is a. Thin Films, Plasma & Surface Engineering Customer Contributions: Absolute Quantification of Deuterium Ion Fluxes amstrad.fund, t.

Schwarz-Selinger, and W. Jacob Max-Planck-Institute für Plasmaphysik the relative ion species composition changes. With increasing pressure more and more D3 + ions are produced at the expense of the. Hydrogen- and deuterium-fueled glow discharges are used for the initial conditioning of magnetic fusion device vacuum vessels following evacuation from atmospheric pressure.

Hydrogenic glow discharge conditioning (GDC) significantly reduces the near-surface concentration of simple adsorbates, such as H/sub 2/O, CO, and CH/sub 4/, and lowers ion. Deuterium is one of two stable isotopes of hydrogen. The nucleus of a deuterium atom, called a deuteron, contains one proton and one neutron, whereas the far more common protium has no neutron in the nucleus.

Deuterium has a natural abundance in Earth's oceans of about one atom in of hydrogen. Thus deuterium accounts for approximately % of all the naturally occurring hydrogen Name, symbol: Deuterium,²H.

Both hydrogen and deuterium are used as main ion to study the isotope e ect onto For this study discharges in both hydrogen and deuterium have been conducted with the combined coverage of the outer divertor target using IR thermography for the heat ux pro les and Langmuir probes for the divertor characterization.

The measured. Jul 22,  · Please use one of the following formats to cite this article in your essay, paper or report: APA. Hiden Analytical. (, July 22).

Deuterium Ion Author: Hiden Analytical. In chemistry, a hydride is the anion of hydrogen, H−, or more commonly it is a compound in which one or more hydrogen centres have nucleophilic, reducing, or basic properties. In compounds that are regarded as hydrides, the hydrogen atom is bonded to a more electropositive element or groups.

Compounds containing hydrogen bonded to metals or metalloids may also be referred to as hydrides. Common examples. The different masses of the three isotopes of hydrogen cause them to have different physical properties. Thus H 2, D 2, and T 2 differ in their melting points, boiling points, densities, and heats of fusion and vaporization.

InHarold Urey and coworkers discovered deuterium by slowly evaporating several liters of liquid hydrogen until a volume of about 1 mL remained. H, the other stable hydrogen isotope, is known as deuterium and contains one proton and one neutron in the nucleus.

All deuterium in the universe is thought to have been produced at the time of the Big Bang, and has endured since that time. Deuterium is not radioactive, and does not represent a Group: 1: H and alkali metals.

This dependence was studied in a series of very similar discharges in which increasing amounts of hydrogen were puffed into a deuterium plasma.

A simple method to estimate the isotopic ratio n{sub H}/n{sub D} using neutron emission measurements is here described. i measured in the ETB of deuterium (D, black squares), hydrogen (H, red diamonds) and helium (He, blue opensquares)plasmas. Independentoftheplasmaspecies, the radial electric field is balanced by the pressure gradient term of the main ions.

It should be noted that in helium plasmas the main ion species is measured directly via CXRS on He2+ (n Cited by: 7. Jan 22,  · Abstract. Ion mobility spectrometry (IMS) coupled with gas-phase hydrogen deuterium exchange (HDX)-mass spectrometry (MS) and molecular dynamic simulations (MDS) has been used for structural investigation of anions produced by electrospraying a sample containing a synthetic peptide having the sequence amstrad.fun by: 8.

Hydrogen is the only element whose isotopes have different names in common use today: the 2 H (or hydrogen-2) isotope is deuterium and the 3 H (or hydrogen-3) isotope is tritium. The symbols D and T are sometimes used for deuterium and amstrad.funrd atomic weight A(H): [, ], Conventional: Abstract.

Previous studies on the spatial discharge structure in the SPIDER source of negative hydrogen/deuterium ions carried out at low applied power are extended towards description of the discharge maintenance under the conditions of the actual rf power deposition of kW planned for a single driver of the source.

The dependence of the deposited films properties over the discharges electrical power and the effect of hydrogenous species (H 2 and/or D 2) addition to main discharge gas (Ar) were investigated.

Accurate elemental analysis of the samples, including detection of hydrogen and deuterium, was performed by ion beam analysis (IBA) techniques: RBS. Previous studies on the spatial discharge structure in the SPIDER source of negative hydrogen/deuterium ions carried out at low applied power are extended towards description of the discharge maintenance under the conditions of the actual rf power deposition of kW planned for a single driver of the source.

Solution-phase hydrogen/deuterium exchange (HDX) in combination with mass spectrometric detection of proteolytic peptides is a valuable tool for characterization of protein-protein interactions. The exchange rates of amide hydrogens at contact surfaces generally slow down several orders of magnitude compared to hydrogens accessible to the solvent.

Electron stimulated desorption ions of hydrogen and deuterium molecules in extremely high vacuum. Vacuum, 47 (), Electron stimulated desorption ions of hydrogen and deuterium molecules in extremely high amstrad.fun: M Takizawa, A Yoshimi, T Katunuma, T Yabe, C Oshima.Jun 17,  · Hydrogen can lose an electron to form a proton, gain an electron to form a hydride ion, or form a covalent bond or polar covalent electron-pair bond.

The three isotopes of hydrogen—protium (1 H or H), deuterium (2 H or D), and tritium (3 H or T)—have different physical properties.and resonant ions can be accelerated to MeV energies which is of interest for ITER in the non-nuclear phase and to W-7X.[3] The three-ion ICRF scenario proposed is minority heating of 3He ions in a deuterium-hydrogen mixture.

In H:D ≈ 70%% plasmas, the left-hand polarized fast wave L-cutoff.