Relevant bibliographies by topics / Argon (N₂/Ar)

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Argon (N₂/Ar)'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 February 2022

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Journal articles on the topic "Argon (N₂/Ar)"

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Ferrari, Piero, and Ewald Janssens. "Argon Adsorption on Cationic Gold Clusters Aun+ (n ≤ 20)." Molecules 26, no. 13 (2021): 4082. http://dx.doi.org/10.3390/molecules26134082.

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The interaction of Aun+ (n ≤ 20) clusters with Ar is investigated by combining mass spectrometric experiments and density functional theory calculations. We show that the inert Ar atom forms relatively strong bonds with Aun+. The strength of the bond strongly varies with the cluster size and is governed by a fine interplay between geometry and electronic structure. The chemical bond between Aun+ and Ar involves electron transfer from Ar to Au, and a stronger interaction is found when the Au adsorption site has a higher positive partial charge, which depends on the cluster geometry. Au15+ is a peculiar cluster size, which stands out for its much stronger interaction with Ar than its neighbors, signaled by a higher abundance in mass spectra and a larger Ar adsorption energy. This is shown to be a consequence of a low-coordinated Au adsorption site in Au15+, which possesses a large positive partial charge.
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Katakuse, I., H. Ito, and T. Ichihara. "Generation of argon and Ar-Al complex clusters, (Ar)+n, (Ar)nAl+ from bubbles in aluminium metal by argon ion bombardment." International Journal of Mass Spectrometry and Ion Processes 99, no. 3 (1990): 207–11. http://dx.doi.org/10.1016/0168-1176(90)85030-6.

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3

Scheier, P., and T. D. Märk. "Metastable decay of singly charged argon cluster ions Ar+n*." International Journal of Mass Spectrometry and Ion Processes 102 (December 1990): 19–44. http://dx.doi.org/10.1016/0168-1176(90)80050-d.

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4

Cassidy, RA, and MT Elford. "The Mobility of Li + Ions in Helium and Argon." Australian Journal of Physics 38, no. 4 (1985): 587. http://dx.doi.org/10.1071/ph850587.

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A drift tube-mass spectrometer system employing Bradbury-Nielsen shutters has been used to measure the mobility of Li + ions in He at 294 and 80 K and Li + ions in Ar at 294 K. The E/N range used was 3 to 80 Td (1 Td == 10 - 21 Y cm2). The zero field reduced mobility for Li + in He was found to be 22�81�0�11 cm2 y-1 s-I at 294 K and 19�64�0�29 cm2 y-1 s-I at 80 K. The value for Li+ in Ar at 294 K is 4�66�0�22 cm2 y-1 s-I. The reduced zero field mobility for the cluster ion Li +. He in He at 80 K and low values of E/ N was found to be 14�84 � 0�22 cm2 y -I s - I. The equilibrium constant for the formation and dissociation of Li + . Ar cluster ions at 294 K was obtained by fitting to the variation of the measured mobility with gas number density at low E/N values. The value obtained, corresponding to thermal equilibrium at 294 K, was (4�0.5)xlO- 19 cm3 .
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Stachoň, Martin, Aleš Vítek, and René Kalus. "Photodissociation of medium-sized argon cluster cations in the visible region." Physical Chemistry Chemical Physics 17, no. 48 (2015): 32413–24. http://dx.doi.org/10.1039/c5cp05257b.

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Semiclassical methods for non-adiabatic dynamics simulations, based on a semiempirical diatomics-in-molecules model of intracluster interactions and the mean-field dynamical approach with the inclusion of quantum decoherence, have been used to study the photodissociation of argon cluster cations, ArN+ (N = 6–19), at Ephot = 2.35 eV.
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Tseng, Kuang Hung, and Kai Chieh Hsien. "Effect of Ar-N2 Mixed Gas on Morphology and Microstructure of Type 316L Stainless Steel TIG Weld Metal." Advanced Materials Research 295-297 (July 2011): 1919–24. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.1919.

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The aim of the present work was to investigate the effects of specific nitrogen gas additions to argon shielding gas on morphology and microstructure of austenitic stainless steel TIG welds. An autogenous TIG welding process was applied on type 316L stainless steel to produce a bead-on-plate weld. The ferrite content of weld metal was measured using a Feritscope. The results indicated that the arc voltage increase as the amount of nitrogen gas added to the argon atmosphere increases. The retained ferrite content of type 316L stainless steel TIG weld metal decreased rapidly as nitrogen gas addition to the argon shielding gas was increased.
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Kurlyandskaya, G. V., S. M. Bhagat, Andrey V. Svalov, Eduardo Fernandez, Alfredo García-Arribas, and José M. Barandiarán. "FeNi-Based Film Nanostructures for High Frequency Applications: Design and Characterization." Solid State Phenomena 168-169 (December 2010): 257–60. http://dx.doi.org/10.4028/www.scientific.net/ssp.168-169.257.

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FeNi films were deposited by DC magnetron sputtering at different Ar pressures. The structure and magnetic properties of the FeNi films are affected by the Ar pressure. Ferromagnetic resonance (FMR) measurements were done at a frequency of about 8.85 GHz. Both the value of resonance field and resonance line width show strong dependence on the Ar pressure: the lowest value of the resonance field and the narrowest resonance width correspond to the smallest argon pressure. Increase of the Ar pressure causes the films to have a significant perpendicular anisotropy with the easy axis pointing out of the plane. The magnetic properties and FMR were also studied for the [FeNi(170 nm)/Ti]n/FeNi(170 nm) (n = 1, 2, 5) structures prepared at the smallest Ar pressure. The FMR studies showed that the obtained multilayers are very robust: the value of the resonance field and resonance line width of the [FeNi/Ti]n/FeNi multilayers are very close to the corresponding values for the FeNi films.
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8

Prudente, Frederico V., Jorge M. C. Marques, and Francisco B. Pereira. "Solvation of Li+ by argon: how important are three-body forces?" Physical Chemistry Chemical Physics 19, no. 37 (2017): 25707–16. http://dx.doi.org/10.1039/c7cp04549b.

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A global geometry search on a new potential energy surface for Li+Arn clusters revealed that three-body interactions must be included to reproduce ab initio structures and accurate energetic features.
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9

Dong, Peng, Xing Bo Liang, Da Xi Tian, Xiang Yang Ma, and De Ren Yang. "Enhanced Internal Gettering of Iron in n/n+ Epitaxial Silicon Wafer: Effect of High Temperature Rapid Thermal Annealing in Nitrogen Ambient." Solid State Phenomena 242 (October 2015): 218–23. http://dx.doi.org/10.4028/www.scientific.net/ssp.242.218.

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We report a strategy feasible for improving the internal gettering (IG) capability of iron (Fe) for n/n+ epitaxial silicon wafers using the heavily arsenic (As)-doped Czochralski (CZ) silicon wafers as the substrates. The n/n+ epitaxial silicon wafers were subjected to the two-step anneal of 650 °C/16 h + 1000 °C/16 h following the rapid thermal processing (RTP) at 1250 °C in argon (Ar) or nitrogen (N2) atmosphere. It is found that the prior RTP in N2 atmosphere exhibits much stronger enhancement effect on oxygen precipitation (OP) in the substrates than that in Ar atmosphere, thereby leading to a better IG capability of Fe contamination on the epitaxial wafer. In comparison with the RTP in Ar atmosphere, the one in N2 atmosphere injects not only vacancies but also nitrogen atoms of high concentration into the heavily As-doped silicon substrate. The co-action of vacancy and nitrogen leads to the enhanced OP in the substrate and therefore the better IG capability for the n/n+ epitaxial silicon wafer.
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10

Seo, Jeongsuk, Mamiko Nakabayashi, Takashi Hisatomi, et al. "The effects of annealing barium niobium oxynitride in argon on photoelectrochemical water oxidation activity." Journal of Materials Chemistry A 7, no. 2 (2019): 493–502. http://dx.doi.org/10.1039/c8ta09950b.

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Dissertations / Theses on the topic "Argon (N₂/Ar)"

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Féron, Patrice. "Étude par des techniques de jets croisés et d'analyse laser de collisions aux énergies thermiques entre atomes métastables (Ne*, He*) et atomes (Ne, He, Ar) ou molécules (N₂, O₂, NO) à l'état fondamental." Paris 11, 1988. http://www.theses.fr/1988PA112281.

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Étude par deux techniques: 1) analyse de temps de vol soit mécanique, soit par dépopulation sélective au moyen d'un laser à colorant accordable ; 2) analyse continue d'état et de vitesse, au moyen d'un laser, pour séparer les vitesses finales, avec deux faisceaux supersoniques. Application à l'étude de la diffusion élastique ne(3)p(0,2)-he par ces deux techniques, des transferts d'énergie d'excitation he(2(1)s)-ne par la 2eme technique, de l'échange de métastabilité pour le système ne-ne sans analyse laser. Bon accord des résultats expérimentaux avec le calcul jwkb des sections efficaces et leur analyse en harmoniques sphériques. Expériences de collisions avec effet penning pour ne avec ar, n(2), no et o(2) : atténuation de l'effet arc-en-ciel pour les molécules, interaction forte et très anisotrope de o(2) et no avec l'état ionique (a(+) + b(-).
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Kasri, Salima. "Développement de sources microplasma en mélange N₂/Ar pour la production d’azote atomique en vue d’une application aux procédés de dépôt de nitrures." Thesis, Sorbonne Paris Cité, 2019. https://tel.archives-ouvertes.fr/tel-03180054.

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Cette thèse a pour but de développer et d’optimiser un nouveau réacteur de dépôt de nitrure de bore hexagonal (h-BN) sur grandes surfaces en utilisant une matrice de micro-décharges à cathode creuse (MHCD) dans un mélange azote/argon. h-BN est un matériau stratégique pour des applications à forte valeur ajoutée telles que la photonique et l’électronique. Une étude fondamentale d’une MHCD DC, réalisée à l’aide de diagnostics électriques et optiques ainsi que d’un modèle global (0D), nous a permis de déterminer les caractéristiques électriques de la décharge, de mettre en évidence la production d’azote atomique dans la MHCD, espèce clé pour le dépôt de nitrure, ainsi que de déterminer la densité électronique. Par ailleurs, un réacteur matriciel fonctionnant en régime impulsionnel a été caractérisé expérimentalement à l’aide de diagnostics électriques et optiques. Les diagnostics électriques nous ont permis d’étudier l’effet de la dilution et de la fréquence sur les paramètres électriques de la décharge. La spectroscopie d’émission optique et l’imagerie rapide nous ont quant à elles permis d’identifier les espèces radiatives, de déterminer les températures dans le plasma ainsi que d’identifier les différentes phases de l’évolution spatio-temporelle de la décharge. Enfin, les premiers tests de dépôts réalisés dans un réacteur dédié nous ont permis de mettre en évidence la faisabilité d’un dépôt de h-BN sur des substrats de 5 cm de diamètre grâce au procédé développé dans le cadre de cette thèse
The aim of this thesis is to develop and optimize a new hexagonal boron nitride (h-BN) deposition reactor on large surfaces using an array of micro hollow cathode discharges (MHCD) in a nitrogen/argon mixture. h-BN is a strategic material for strong added value applications, such as photonics and electronics. A fundamental study of one DC MHCD, carried out using electrical and optical diagnostics as well as a global model (0D), has allowed the electrical characteristics of the discharge to be measured, the production of atomic nitrogen in the MHCD to be highlighted, a key species for nitride deposition, as well as the electron density to be determined. Moreover, a matrix reactor operating under a ns-pulsed excitation has been experimentally characterized using electrical and optical diagnostics. Electrical diagnostics have been used to study the effect of dilution and frequency on the electrical parameters of the discharge. Optical emission spectroscopy and fast imaging have allowed the identification of radiative species, the determination of the temperatures in the plasma as well as the identification of the different phases of the spatio-temporal evolution of the discharge. Finally, the first deposition experiments, carried out in a dedicated reactor, have demonstrated the feasibility of h-BN deposition on 5 cm in diameter substrates thanks to the process developed in the frame of this thesis
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Conference papers on the topic "Argon (N₂/Ar)"

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Walker, Barry C. "Ionization of Argon n=2 (Ar[sup +9] to Ar[sup +16]) by a “relativistic” laser field." In The 8th international conference on multiphoton processes (ICOMP VIII). AIP, 2000. http://dx.doi.org/10.1063/1.1291983.

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Ju´nior, Petroˆnio Z., Paulo H. Alcaˆntara, Ricardo A. Fedele, Geraldo J. M. Paiva, and Ney R. W. Chaves. "Influence of Nitrogen Gas of Three Different Procedures of GTAW Welding on Final Metallurgical and Mechanical Properties of a 2% W SDSS Piping." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71572.

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Duplex stainless steels (DSS) are finding increased application on offshore process plants in Brazil. Welding them is always a challenge. Pure argon and argon/low-nitrogen gas mixtures are available for welding them with GTAW process. The use of the same kind of gases on shielding and backing is usual. If no nitrogen is present in the gas mixtures there may be loss of nitrogen from the weld metal or HAZ. Three different welding procedures were tested for a 2% tungsten superduplex parent metal to verify the loss of nitrogen from weld metal and HAZ. First procedure used a 2%N-88%Ar-10%He as the shielding mixture and pure Ar as the backing gas while the second one used pure Ar as shielding and pure nitrogen as backing gas. A third procedure with no nitrogen for shielding or backing was also carried out for comparisons. Chemical analyses, corrosion test and determination of austenite/ferrite content were done to check metallurgical and chemical properties. Mechanical tests were performed to compare mechanical properties of the weld metal and HAZ. ASME Code, section IX, plus Norsok standard M-601 were referenced. Results indicate good mechanical behavior, corrosion resistance and austenite/ferrite phases balance in both procedures that used nitrogen as one of the gases. The procedure using only pure argon showed a decrease of austenite content in weld metal and heat affected zone. However, it fulfilled all the requirements. They didn’t present secondary phases or very significant variances on austenite presence even on weld metal and HAZ.
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Iwata, Yoshihiro, Hideki Harano, Chikara Ito, and Takafumi Aoyama. "Improvement of the RIMS Detection Sensitivity for Application to Failed Fuel Detection and Location System of the Fast Reactor." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29395.

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In the fast reactors, rapid and accurate detection of fuel failures as well as subsequent identification of failed fuel location are essential to achieve their safety operation and high plant availability. The gas tagging method, currently employed in the prototype fast breeder reactor Monju, is one of the efficient ways for the failed fuel detection and location (FFDL) technique, the principle of which is the isotope analysis of the argon (Ar) cover gas that includes, in case of fuel failure, a partial amount of leaked krypton (Kr) and xenon (Xe) originally loaded into each fuel pin. We propose a new type of FFDL technique using laser resonance ionization mass spectrometry (RIMS) for the isotope analysis of the cover gas in view of selective ionization of a specific element to obtain high S/N ratio. Nevertheless, the actual experimental data shows the existence of Ar and Ar2 non-resonant ionization by the photoelectron generated in the vacuum chamber to hinder precise measurement of Kr and Xe. We could successfully decrease the effect of these ions by one to two orders of magnitude by applying both a set of a neutralization apparatus and a Brewster window, and an electrode with a slit-type hole in the ion acceleration region, resulting in reliability improvement of RIMS in the FFDL system.
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