Article
Physics, Fluids & Plasmas
J. Levaton, A. N. Klein, J. Amorim, J. H. F. Severo
Summary: In this study, the mechanisms of molecular dissociation and atomic excitation occurring in a flowing nitrogen DC discharge and its post-discharge were experimentally and theoretically investigated. The experimental conditions leading to the occurrence of pink afterglow plasma in the post-discharge tube were analyzed. The results show that the dissociation processes in the positive column are dominated by direct electron impact mechanism at earlier discharge gas residence times. However, for longer times, reactions between electronically excited states and N-2 vibrational states become the dominant dissociation mechanisms. The dissociation processes in the pink afterglow also present significant rates compared to those in the positive column, demonstrating their effectiveness in the post-discharge. The excitation mechanisms of N(D-2) and N(P-2) were also examined, and it was observed that the molecular dissociation and atomic excitation mechanisms strongly depend on the N-2 vibrational distribution function.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Geochemistry & Geophysics
Zenghao Gao, Ya-Nan Yang, Shui-Yuan Yang, Yuan Li
Summary: The solubility of nitrogen in magmatic melts was investigated through high-pressure experiments. The results showed that nitrogen mainly exists as N2 in silicate melts and its solubility is influenced by pressure and the structure of the melt. An empirical model was developed to predict the solubility of nitrogen and other gases in magmatic melts. This research is important for understanding degassing processes and the formation of nitrogen-rich atmospheres in Earth's interior.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Physics, Applied
Rasmus Talviste, Peeter Paris, Juri Raud, Toomas Plank, Kalev Erme, Indrek Jogi
Summary: This study focused on determining the Townsend ionization coefficient alpha in mixtures of Ar with N-2 in a dark non-self-sustaining Townsend discharge. Experimental results showed that the density normalized ionization coefficient alpha/N increased with E/N and decreased with N-2 content in the gas mixture. Comparisons with Bolsig+ calculations revealed that experimental results were lower than predicted when N-2 concentration was between 10% and 50% in the mixture.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Fluids & Plasmas
Petr Bilek, Tiago Cunha Dias, Vaclav Prukner, Petr Hoffer, Vasco Guerra, Milan Simek
Summary: The emission spectra of a streamer discharge in pure nitrogen are essential for studying the kinetics of excited electronic states of N2 and validating numerical models. In this work, we characterized a streamer monofilament in a dielectric barrier discharge configuration and obtained time-resolved images and emission spectra with nanosecond resolution. The results provide evidence of cathode-directed streamer formation and allow for the determination of streamer propagation velocity and typical E/N values.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Applied
J. Levaton, A. N. Klein, J. Amorim, J. H. F. Severo
Summary: This study focuses on the ionization and ion transfer rates in flowing nitrogen DC discharges and post-discharges. By combining experimental and theoretical analysis, 18 ionization and nine ion transfer mechanisms were studied, revealing the significant role of electron density variation in the rates behavior. The rates observed in the pink afterglow phenomenon were found to be relevant to those in the discharges.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Sam Armenta Butt, Stephen D. Price
Summary: This study investigates the reactivity, energetics, and dynamics of bimolecular reactions between S2+ and three neutral species (Ar, H-2, and N-2). The reactions involve single electron-transfer processes, with the reaction between S2+ and Ar showing strong forward scattering and Landau-Zener style dynamics. Collisions between S2+ and H-2 and N-2 result in non-dissociative and dissociative single electron-transfer reactions, respectively, with evidence for the formation of long-lived collision complexes in the dissociative channel.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
S. Palacek, M. Beseda, R. Kalus, M. Benhenni, F. X. Gadea, T. Leininger, M. Yousfi
Summary: A detailed dynamical study on N-2(+)/He collisions in the electronic ground state of the collision complex is presented. Non-reactive and reactive cross-sections were calculated for a broad range of collision energies and different initial rotational-vibrational excitations of the ion. The effect of rotational alignment of the N-2(+) ion on the calculated cross-sections was assessed and analyzed.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Jing Zhou, Dingwang Yuan, Bowen Huang, Tuanping Xie, Li Cai, Wangyu Hu
Summary: The study investigates the catalytic ability of Ru-based Heusler alloys in N2 decomposition, showing that the Ru atoms on the surfaces significantly improve adsorption activity and reduce the energy barrier for N2 molecules. The (001) surfaces of Ru2ScZ and Ru2TiZ are particularly effective for N2 activation with lower energy barriers around 0.4 eV. The unique catalytic performance of Ru-based Heusler alloys is attributed to the synergistic role of electronic and geometric effects on the ordered alloy surfaces.
APPLIED SURFACE SCIENCE
(2022)
Article
Environmental Sciences
Jason M. Taylor, Isabelle M. Andersen, Alexa K. Hoke, Patrick T. Kelly, J. Thad Scott
Summary: Measuring the ratio of dissolved N2 to Ar can provide insights into the importance of nitrogen fixation and denitrification in lake ecosystems. The results of this study showed that as nitrogen availability increased, the N-2:Ar saturation ratio also increased, indicating a shift from nitrogen fixation to denitrification.
Article
Physics, Fluids & Plasmas
Xin Yang, Elijah Jans, Caleb Richards, Sai Raskar, Dirk van den Bekerom, Kai Wu, Igor Adamovich
Summary: This study examines the role of the electronic excited states of N-2(A(3)Sigma(+)(u)) molecules in the dissociation of N2 in plasmas. It is found that energy pooling in collisions between N-2(A(3)Sigma(+)(u)) molecules plays a major role in N2 dissociation. Additionally, the rapid quenching by H atoms leads to a significant reduction in N-2(A(3)Sigma(+)(u)) populations and the rate of N atom generation.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Yu-Chia Lin, Sheng-Yu Hsu, Yuan-Tai Lai, Pei-Hung Kuo, Su-Yueh Tsai, Jenq-Gong Duh
Summary: In this study, high entropy nitride coatings with different nitrogen concentrations were fabricated, and the effects of nitrogen content on crystal structure, chemical composition, deposition rate, residual stress, and hardness were investigated. It was found that when the nitrogen concentration reached 50%, the maximum hardness of the coating was around 35 GPa.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Physics, Applied
Alice Remigy, Salima Kasri, Thibault Darny, Hiba Kabbara, Ludovic William, Gerard Bauville, Kristaq Gazeli, Stephane Pasquiers, Joao Santos Sousa, Nelson De Oliveira, Nader Sadeghi, Guillaume Lombardi, Claudia Lazzaroni
Summary: This study investigates the micro-hollow cathode discharge operated in Ar/N-2 gas mixture and provides insights into the mechanisms and control of N atom production. The results show that the physical parameters, such as hole diameter and N-2 percentage, greatly affect the density of N atoms.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
A. Remigy, X. Aubert, S. Prasanna, K. Gazeli, L. Invernizzi, G. Lombardi, C. Lazzaroni
Summary: In this study, nanosecond two-photon absorption laser-induced fluorescence (TALIF) is used to measure the density of nitrogen atoms in a plasma generated by a micro-hollow cathode discharge (MHCD). The research shows good agreement between the N-atom density measured using TALIF and previous measurements using vacuum ultraviolet Fourier transform absorption spectroscopy when the pressure is the same on both sides of the electrodes in the MHCD. Additionally, the study explores the impact of discharge current, N-2 percentage in the gas mixture, and pressure differentials on both sides of the MHCD on the N-atom density. It is found that the N-atom density is more sensitive to pressure changes in the low-pressure side of the MHCD.
PHYSICS OF PLASMAS
(2022)
Article
Environmental Sciences
Shijuan Tian, Wenyi Deng, Yaxin Su
Summary: The study found that intense discharge was observed in pure Ar or N2, but weakened in gas mixtures, and NO conversion rate can be increased by adjusting parameters such as tungsten wire diameter, number, microwave power, gas flow rate and initial NO concentration, with a maximum of 91.5% achieved. Depositions of tungsten oxides and nitrides formed by tungsten ions consuming NO were found on the inner surface of the reaction tube after reactions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Optics
Valentin Ferrer, Jean-Pierre Gardou, Frederic Marchal, Andre Ricard, Jean-Philippe Sarrette
Summary: The emission spectrum and vibrational intensities of nitrogen and mixtures of nitrogen with noble gases were studied. The relative populations of N-2(B, v') were deduced from recorded spectra and N-atom concentrations were measured. Rate coefficients for N-atom recombination in specific vibronic levels were obtained. The concentrations of N-2(A), N-2(X, v = 12-13) molecules, and N-2(+) ions were also determined.
EUROPEAN PHYSICAL JOURNAL D
(2022)
Article
Nanoscience & Nanotechnology
B. Despax, F. Gaboriau, H. Caquineau, K. Makasheva
Article
Physics, Applied
F. Gaboriau, R. Baude, G. J. M. Hagelaar
APPLIED PHYSICS LETTERS
(2014)
Article
Materials Science, Multidisciplinary
E. Panousis, F. Clement, N. Merbahi, A. Ricard, M. Yousfi, B. Held, J-F. Loiseau, O. Eichwald, F. Gaboriau
HIGH TEMPERATURE MATERIAL PROCESSES
(2009)
Article
Physics, Applied
A. Erradi, R. Clergereaux, F. Gaboriau
JOURNAL OF APPLIED PHYSICS
(2010)
Article
Physics, Applied
Namjun Kang, Freddy Gaboriau, Soo-Ghee Oh
JOURNAL OF APPLIED PHYSICS
(2012)
Article
Physics, Applied
B. Rouffet, F. Gaboriau, J. P. Sarrette
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2010)
Article
Physics, Applied
Namjun Kang, Freddy Gaboriau
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2011)
Article
Physics, Fluids & Plasmas
L. Dubois, F. Gaboriau, L. Liard, C. Boniface, J. P. Boeuf
PHYSICS OF PLASMAS
(2018)
Article
Physics, Fluids & Plasmas
L. Dubois, F. Gaboriau, L. Liard, D. Harribey, C. Henaux, L. Garrigues, G. J. H. Hagelaar, S. Mazouffre, C. Boniface, J. P. Boeuf
PHYSICS OF PLASMAS
(2018)
Article
Physics, Fluids & Plasmas
Namjun Kang, Freddy Gaboriau, Soo-ghee Oh, Andre Ricard
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2011)
Article
Physics, Fluids & Plasmas
F. Gaboriau, J. P. Boeuf
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2014)
Article
Instruments & Instrumentation
Namjun Kang, Soo-ghee Oh, Freddy Gaboriau, Andre Ricard
REVIEW OF SCIENTIFIC INSTRUMENTS
(2010)
Article
Instruments & Instrumentation
R. Baude, F. Gaboriau, G. J. M. Hagelaar
REVIEW OF SCIENTIFIC INSTRUMENTS
(2013)
Article
Physics, Fluids & Plasmas
A. Martin Ortega, A. Guglielmi, F. Gaboriau, C. Boniface, J. P. Boeuf
PHYSICS OF PLASMAS
(2020)