Article
Optics
Hirotake Sugawara, Yuya Nakata
Summary: This paper investigates the average velocity of an electron swarm under the combined effects of an alternating electric field and a direct current magnetic field. It extends the previous analytic solution to cover arbitrary crossing angles and provides explicit formulas for the x, y, and z components of the velocity vector. The study reveals that the fundamental behavior of the velocity loci remains unchanged even with arbitrary crossing angles, but the orientation of the plane containing the loci may vary with different parameters.
EUROPEAN PHYSICAL JOURNAL D
(2022)
Article
Chemistry, Physical
Xin He, Ben-Xi Zhang, Yi-Feng Wang, Yan-Yi Zhang, Yan-Ru Yang, Xiao-Dong Wang, Duu-Jong Lee
Summary: The electrocoalescence dynamics of charged droplets with different deflected angles were studied using molecular dynamics simulations. The results showed that under a weak electric field, complete coalescence could be achieved at deflected angles of 0 degrees and 50 degrees, but not at 90 degrees. With increasing electric field strength, partial coalescence and non-coalescence phenomena were observed.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Physics, Multidisciplinary
Yahya N. Shaar, Joseph A. Rizcallah, Sergey P. Karnilovich
Summary: This study investigates the motion of a charged particle in a plane electromagnetic wave field propagating perpendicular to a crossed configuration of uniform electric and magnetic fields. The relativistic equations of motion are derived and integrated using a constant of motion in a special case. The obtained solutions are analyzed for various polarizations of the electromagnetic wave.
Article
Mathematics, Applied
Ting Li, Bin Wang
Summary: This paper focuses on the numerical symplectic approximation of the charged-particle dynamics under homogeneous and non-homogeneous magnetic fields. Continuous-stage methods and exponential integrators are utilized to formulate symplectic methods for CPD. Numerical experiments support the theoretical analysis and demonstrate the remarkable numerical behavior of the proposed methods.
ADVANCES IN COMPUTATIONAL MATHEMATICS
(2023)
Article
Geochemistry & Geophysics
Jinghe Li, Zhanxiang He, Hanying Bai
Summary: This paper proposes a numerical technique for modeling DC potential fields in charged lossy dielectric media, and verifies its effectiveness through comparisons with numerical cases and field surveys.
JOURNAL OF GEOPHYSICS AND ENGINEERING
(2023)
Article
Physics, Fluids & Plasmas
Tiago C. Dias, Carlos D. Pintassilgo, Vasco Guerra
Summary: This study numerically investigates the electron kinetics under AC/DC electric fields and DC magnetic fields at arbitrary angles. Both model gases and real gases are studied, and Monte Carlo simulations are used with an upgraded version of the LoKI-MC code. The role of the magnetic field is discussed, and specific phenomena in Ar are confirmed, including the different effects of increasing E/N and B/N on electron mean energy. In AC electric fields, the synchronization of cyclotron motion with the electric field enhances electron acceleration, but this synchronization breaks down when the collision frequency is much higher than the cyclotron frequency.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
P. W. Stokes, S. P. Foster, M. J. E. Casey, D. G. Cocks, O. Gonzalez-Magana, J. de Urquijo, G. Garcia, M. J. Brunger, R. D. White
Summary: Experimental and theoretical cross sections for electron transport in THFA were reviewed and a complete set was proposed, which was refined using a neural network model to solve the inverse swarm problem. Discrepancies between simulation and experiment were addressed, resulting in a set of electron-THFA cross sections that showed higher consistency with experimental measurements. Additionally, electron transport coefficients in pure THFA were calculated across a range of reduced electric fields.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Oncology
Sergej Tomic, Andelija Petrovic, Nevena Puac, Nikola Skoro, Marina Bekic, Zoran Lj. Petrovic, Miodrag Colic
Summary: This study found that plasma-activated medium (PAM) induced immunogenic cell death in tumor cells and increased the immunogenicity of tumor lysates, enhancing the maturation potential of dendritic cells and promoting cytotoxic T cell responses. Compared to standard methods, this novel approach could be suitable for improving DC-based cancer immunotherapy.
Article
Optics
Jelena Marjanovic, Dragana Maric, Gordana Malovic, Zoran Lj Petrovic
Summary: This paper presents results for effective ionisation coefficients obtained from low-pressure DC discharges in vapours of alcohols, and compares them with available literature data. The results show good agreement in the high E/N range.
EUROPEAN PHYSICAL JOURNAL D
(2021)
Article
Optics
Zoran Lj Petrovic, Olivera Sasic, Snjezana Dupljanin, Paul Maguire
Summary: In this paper, a set of cross sections for electron collisions with DME is discussed and analyzed using experimental data. The derived data can be used for modeling DC and RF discharges and plasma applications containing pure DME and its mixtures.
EUROPEAN PHYSICAL JOURNAL D
(2022)
Article
Optics
Andrea Jurov, Nikola Skoro, Kosta Spasic, Martina Modic, Natasa Hojnik, Danijela Vujosevic, Milena Durovic, Zoran Lj Petrovic, Uros Cvelbar
Summary: Atmospheric pressure plasmas are being studied for their effects on microbial deactivation. The research focuses on optimizing the parameters of atmospheric pressure plasma jet (APPJ) to deactivate different bacteria strains in a medium. Diagnostic methods such as optical and electrical plasma jet diagnostics were used to understand the properties of plasma and the connection between reactive species in the gas and liquid phases. The study found that higher discharge powers and gas flow rates were more efficient in deactivating bacteria.
EUROPEAN PHYSICAL JOURNAL D
(2022)
Article
Geosciences, Multidisciplinary
C. Koehn, O. Chanrion, M. Bodker Enghoff, S. Dujko
Summary: The Miller-Urey experiment suggests that lightning may have played a role in the origin of life on Earth by generating amino acids and carbon acids. Simulations indicate that discharges on Primordial Earth might have been more challenging to initiate.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Physics, Fluids & Plasmas
I Simonovic, D. Bosnjakovic, Z. Lj Petrovic, R. D. White, S. Dujko
Summary: Using a multi-term solution of the Boltzmann equation and Monte Carlo simulation, this study investigates the behavior of third-order transport coefficients for electrons in model gases and real gases. Negative values are observed in certain cases, and the accuracy of approximation methods is also examined. The influence of electron attachment and ionization on the transport tensor is analyzed, and the contribution of the third-order transport tensor to the swarm's spatial profile is investigated.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Fluids & Plasmas
Dejan Maletic, Dean Popovic, Nevena Puac, Zoran Lj Petrovic, Slobodan Milosevic
Summary: This paper compares the fast Intensified Charge Coupled Device (ICCD) imaging with the newly developed diagnostic method of laser induced breakdown in plasma jet. The results show that laser induced breakdown spectroscopy can be used as a complementary diagnostics technique with ICCD measurements.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Dale L. Muccignat, Peter W. Stokes, Daniel G. Cocks, Jason R. Gascooke, Darryl B. Jones, Michael J. Brunger, Ronald D. White
Summary: This study proposes a method to extract electron-liquid phase cross-sections through measuring energy loss spectra of scattered electrons. Machine learning techniques and Monte Carlo simulation are used to invert the data and extract the cross-sections. The accuracy of the extracted cross-sections varies, with the elastic cross-section for neon found to be within 9% accuracy, while simultaneous extraction of elastic and ionisation cross-sections decreases the accuracy.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Physical
Stephen Sanderson, George Vamvounis, Alan E. Mark, Paul L. Burn, Ronald D. White, Bronson W. Philippa
Summary: Solution-processing of organic light-emitting diode films has potential advantages over vacuum-deposition, but may result in lower device performance. Molecular dynamics simulations were used to study solvent evaporation during solution processing and its effects on charge transport and exciton dynamics.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Review
Chemistry, Physical
Ana Lozano, Adrian Garcia-Abenza, Francisco Blanco Ramos, Mahmudul Hasan, Daniel S. Slaughter, Thorsten Weber, Robert P. McEachran, Ronald D. White, Michael J. Brunger, Paulo Limao-Vieira, Gustavo Garcia Gomez-Tejedor
Summary: This Review presents a comparative study between electron and positron scattering cross sections from CO2 molecules. The study reveals important differences in their scattering behavior at different energies. It provides a comprehensive set of scattering cross section data for both electron and positron, including elastic and inelastic scattering channels. However, inconsistencies found between different model potential calculations suggest the need for more sophisticated methods in future calculations.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Physics, Fluids & Plasmas
S. Dujko, D. Bosnjakovic, M. Vass, P. Hartmann, I Korolov, N. R. Pinhao, D. Loffhagen, Z. Donko
Summary: We measured the electron swarm transport coefficients in CO at room temperature under time-of-flight conditions by scanning drift tube. The measurements were compared with modeling results and other experimental data. Monte Carlo simulations and solving the electron Boltzmann equation were used to obtain the modeling results. Generally, good agreement was found between the measured and calculated transport coefficients. A strategy to improve the cross-section set used to explain discrepancies at lower E/N values was proposed.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
G. J. Boyle, P. W. Stokes, R. E. Robson, R. D. White
Summary: Seminal gas discharge experiments of the late 19th and early 20th centuries laid the foundations of modern physics, and the influence of this golden era continues to resonate well into the 21st century through modern technologies, medical applications, and fundamental scientific investigations. The kinetic equation formulated by Ludwig Boltzmann in 1872 has been instrumental in analyzing highly non-equilibrium situations, and its full potential has only been realized in the past 50 years or so with advancements in computing power and analytical techniques. This article discusses the need for accurate methods in studying charged particles in gases, highlights the inadequacy of traditional approximations, and explores the emerging role of Boltzmann's equation in determining cross sections using machine learning with artificial neural networks.
JOURNAL OF CHEMICAL PHYSICS
(2023)