Article
Meteorology & Atmospheric Sciences
Clemens Spensberger, Camille Li, Thomas Spengler
Summary: The distinction between eddy-driven and subtropical jets is conceptually important and well-founded based on different driving mechanisms and dominant types of variability. Instantaneous observations in potential temperature-wind speed space reveal a clear bimodality, with subtropical and eddy-driven jets aligned with their expected characteristics. This bimodality is most pronounced in the western North Pacific during winter. Clarifying the classification of instantaneous jets in this region provides new insights into the dynamics of jets in the climatological mean state.
JOURNAL OF CLIMATE
(2023)
Article
Physics, Fluids & Plasmas
Yue Liu, Ihor Korolov, Jan Trieschmann, David Steuer, Volker von der Gathen, Marc Boke, Lena Bischoff, Gerrit Hubner, Julian Schulze, Thomas Mussenbrock
Summary: The study investigates the excitation of atmospheric pressure helium plasma jets with oxygen admixture using a hybrid simulation code to control the electron energy probability function through tailored voltage waveforms, enhancing the generation of reactive neutral species.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Article
Spectroscopy
Wonwook Lee, Tuyen Ngoc Tran, Cha-Hwan Oh
Summary: In this study, a helium atmospheric pressure plasma jet (APPJ) system was constructed to generate two guided streamers. The propagation of the guided streamer and its interaction with a grounded metallic target and pulsed laser were investigated. The results showed that the target extended the lifetime of the plasma radiation and the pulsed laser enhanced the spectra of the helium APPJ. The study also examined the relationship between the time interval of the pulsed laser and the guided streamer and various parameters.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2023)
Article
Physics, Applied
T. Winzer, D. Steuer, S. Schuettler, N. Blosczyk, J. Benedikt, J. Golda
Summary: This paper reports on a new type of plasma jet, called the capillary-jet, which can operate stably at high input powers and extends the accessible parameter range. The study results show that the discharge of the capillary-jet is similar to the well-studied COST-Jet, and most of the power is dissipated into the heating of the plasma feed gas.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Zhaoming Xia, Yue Yin, Jun Li, Hai Xiao
Summary: Due to limited degrees of freedom, stable single-atom catalysts (SACs) often have one energetically lower structure that dominates over other high-energy metastable structures. However, our experiments with SACs anchored on CeO2 reveal that the high-energy metastable structures, although in much lower proportion than the dominant lowest-energy structure, can greatly influence catalysis due to their unique coordination environment and oxidation state. This discovery challenges the common assumption in SAC studies and calls for new developments to explore and exploit catalysis via high-energy metastable structures.
Article
Multidisciplinary Sciences
Frank Y. Gao, Zhuquan Zhang, Zhiyuan Sun, Linda Ye, Yu-Hsiang Cheng, Zi-Jie Liu, Joseph G. Checkelsky, Edoardo Baldini, Keith A. Nelson
Summary: Studying nonequilibrium hidden states is important for understanding the strong coupling between microscopic degrees of freedom in quantum materials and for the development of optoelectronic devices. Using single-shot spectroscopy techniques, the researchers were able to directly visualize the ultrafast formation of a long-lived hidden phase in the electronic crystal 1T-TaS2. They also proposed a theory of fluctuation-dominated process to explain the nature of the metastable state.
Article
Physics, Applied
Delin Kong, Ping Zhu, Feng He, Ruoyu Han, Bingyan Yang, Manyu Wang, Jiting Ouyang
Summary: The experimental and numerical results demonstrated that the introduction of N-2 and O-2 admixture significantly affects the length and propagation velocity of a helium atmospheric-pressure plasma jet. The changes in electron density outside the grounded electrode are related to the modifications in jet length.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Fluids & Plasmas
Laurent Invernizzi, Nader Sadeghi, Florent P. Sainct, Philippe Guillot
Summary: This work investigates the spatial variations of the helium He(2(3)S(1)) metastable atom densities in a plasma jet at atmospheric pressure. The radial profiles of He(2(3)S(1)) density along the plasma jet are deduced under different conditions. The influence of outlet tube diameter, gas flow rate, and electric field on the density distribution of the plasma jet is analyzed.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
C. M. Western, J-P Booth, A. Chatterjee, N. de Oliveira
Summary: Updated analyses of singlet Rydberg states of O-2 were conducted using high-quality FT-VUV spectra and ab initio calculations, providing quantitative cross-sections for Rydberg - transitions.
Article
Astronomy & Astrophysics
A. H. Cerqueira, B. Lefloch, A. Esquivel, P. R. Rivera-Ortiz, C. Codella, C. Ceccarelli, L. Podio
Summary: The study revisits the physical origin of the mass-velocity relationship in jet-driven protostellar outflows and investigates the contributions of different regions of the outflow. The research finds that excluding the jet contribution, the mass-velocity relationship can be well described by a single exponential law, while the jet contribution results in additional components in the mass-velocity relationship.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Mechanics
Shaofeng Xu, Lili Gu, Junlin Fang, Yarong Zhang, Ying Guo, Jianjun Shi
Summary: This study develops a numerical solver based on graphic processing units to simulate multicomponent gas flows. Two- and three-dimensional Jacobian matrices are used to reconstruct numerical fluxes and implement a total variation diminishing scheme. The solver is validated through studying the early-stage mass transfer of gas jets and shows stable functioning despite high mass fraction gradients. It provides a better understanding of gas jet dynamics and offers a mathematical foundation for constructing higher schemes.
Article
Physics, Multidisciplinary
Lulu Liu, Shoutao Zhang, Haijun Zhang
Summary: By using first-principles calculations, researchers have identified three new stable neon-nitrogen compounds that exhibit high thermal stability and ultra-high energy densities, surpassing the explosive performance of traditional explosive material TNT.
CHINESE PHYSICS LETTERS
(2022)
Article
Physics, Fluids & Plasmas
Shu-Han Gao, Ru-Gong Cheng, Yuan-Tao Zhang
Summary: In this study, the optimizations of operation mode in atmospheric pulse modulation RF discharges are investigated using a 1-D fluid model. The breakdown voltage and alpha-gamma mode transition voltage both decrease as the duty cycle increases, while a minimum breakdown voltage can be observed by altering the modulation frequency at a constant duty cycle. The increase in the number of applied RF cycles during the power-on phase greatly contributes to the breakdown and mode transition.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2022)
Article
Astronomy & Astrophysics
Nicholas Dietrich, Tomoko Matsuo, Chih-Ting Hsu
Summary: This study demonstrates the potential of using a physics-based, data assimilation approach with ionospheric observations to reduce orbit errors and improve neutral densities. By assimilating electron density profiles derived from radio occultation observations, neutral temperature and neutral winds can be updated, leading to significant improvements in accuracy. The study also shows a reduction in orbit errors and improvement in helium composition errors.
SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS
(2022)
Article
Physics, Applied
Yuanyuan Jiang, Yanhui Wang, Jiao Zhang, Dezhen Wang
Summary: This study investigates the spatial-temporal evolution and transport of singlet delta oxygen in an atmospheric pressure plasma jet using 2D fluid modeling. It finds that the O-2(a(1)Delta(g)) density distribution varies with different oxygen admixtures and the gas flow velocity affects its production and transport.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Applied
J. Ellis, J. Branson, K. Niemi, E. Wagenaars, T. Gans
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2020)
Article
Physics, Applied
Gregory J. Smith, James Ellis, Roba Moussaoui, Cedric Pardanaud, Celine Martin, Jocelyn Achard, Riadh Issaoui, Timo Gans, James P. Dedrick, Gilles Cartry
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2020)
Article
Physics, Fluids & Plasmas
Sandra Schroter, Jerome Bredin, Andrew R. Gibson, Andrew West, James P. Dedrick, Erik Wagenaars, Kari Niemi, Timo Gans, Deborah O'Connell
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2020)
Article
Physics, Applied
Alexandra Brisset, Andrew R. Gibson, Sandra Schroeter, Kari Niemi, Jean-Paul Booth, Timo Gans, Deborah O'Connell, Erik Wagenaars
Summary: This study investigates the impact of adding oxygen and water vapor to helium plasma on the density of OH, revealing that the addition of O-2 leads to a significant increase in atomic oxygen density. The simulations show that OH, O, and O-3 densities can be controlled relatively independently over a wide range of conditions through the addition of multiple gas admixtures.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Editorial Material
Physics, Fluids & Plasmas
Sadruddin Benkadda, Satoshi Hamaguchi, Magali Muraglia, Deborah O'Connell
PHYSICS OF PLASMAS
(2021)
Article
Physics, Applied
Gregory J. Smith, Lenny Tahri, Jocelyn Achard, Riadh Issaoui, Timo Gans, James P. Dedrick, Gilles Cartry
Summary: The production of negative ions is crucial for various applications such as mass spectrometry, materials surface processing, and magnetic confined fusion. Investigating materials and techniques to avoid low work function metals can expand the application of negative ion sources. Using pulsed sample biasing to study the surface production of negative ions from nitrogen-doped diamond shows a higher negative ion yield and suggests the formation of an optimal ratio of defects on the surface for enhanced production.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Fluids & Plasmas
Alexandra Brisset, Benjamin Harris, Aaron Dickenson, Kari Niemi, James Walsh, Erik Wagenaars
Summary: Control of plasma chemistry is crucial for atmospheric pressure plasma in various applications. This study investigates the effects of humidity on discharge development, electric field, and electron density through experiments and modeling, providing experimental data for verifying kinetic models of plasmas in controlled environments.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Fluids & Plasmas
Jonathan Tennyson, Sebastian Mohr, M. Hanicinec, Anna Dzarasova, Carrick Smith, Sarah Waddington, Bingqing Liu, Luis L. Alves, Klaus Bartschat, Annemie Bogaerts, Sebastian U. Engelmann, Timo Gans, Andrew R. Gibson, Satoshi Hamaguchi, Kathryn R. Hamilton, Christian Hill, Deborah O'Connell, Shahid Rauf, Kevin van 't Veer, Oleg Zatsarinny
Summary: The Quantemol database is a valuable resource for plasma models, providing cross sections and rates of important processes. It includes data on heavy particle collisions, electron collision processes, and surface processes. Users can access the data through a web interface or application program interface and use it in popular plasma modeling codes.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Fluids & Plasmas
Helen L. Davies, Vasco Guerra, Marjan van der Woude, Timo Gans, Deborah O'Connell, Andrew R. Gibson
Summary: Characterisation of vibrational kinetics in nitrogen-based plasmas at atmospheric pressure is crucial for various applications. A 0-dimensional plasma chemical-kinetics model was used to study vibrational kinetics in pulsed atmospheric pressure plasmas operating in pure nitrogen. The simulations show that the production of vibrationally excited states is dominated by electron-impact processes at lower powers, but switches to vibrational energy transfer processes at higher powers, resulting in significant increase in the population of vibrational levels.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Review
Physics, Fluids & Plasmas
Luis L. Alves, Markus M. Becker, Jan van Dijk, Timo Gans, David B. Go, Katharina Stapelmann, Jonathan Tennyson, Miles M. Turner, Mark J. Kushner
Summary: The field of low-temperature plasmas (LTPs) excels by its intellectual diversity, interdisciplinarity, and range of applications. Communication challenges arise due to diverse reporting practices and expectations. This paper addresses these challenges by discussing standards for measurements, diagnostics, computations, reporting, and plasma sources to improve communication and transparency within the LTP field.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
