Article
Physics, Applied
C. Lazarou, C. Anastassiou, I Topala, A. S. Chiper, I Mihaila, V Pohoata, G. E. Georghiou
Summary: In this study, the evolution of a capillary helium atmospheric pressure plasma jet (APPJ) with and without the presence of oxygen admixtures is numerically investigated using a two-dimensional axi-symmetric model. The model is compared with experimental measurements, showing that it accurately captures the discharge dynamics. The results indicate that the O-2 Penning reactions become more important than the N-2 reactions when oxygen is added to the plasma gas.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Multidisciplinary
Talviste Rasmus, Erme Kalev, Paris Peeter, Raud Juri, Plank Toomas, Jogi Indrek
Summary: He:O-2 gas mixtures are popular in non-thermal plasma applications due to their good thermal conductivity and high production of reactive oxygen species. This study focused on experimentally determining the reduced apparent effective ionization coefficient in He:O-2 mixtures. The results were compared with a theoretical model and showed good agreement, highlighting the importance of considering He metastable species and electron attachment in atmospheric pressure plasmas.
Article
Chemistry, Physical
Silvia Tanteri, Sean D. S. Gordon, Junwen Zou, Andreas Osterwalder
Summary: This study investigates the chemi-ionization of Ar, Kr, N-2, H-2, and D-2 by Ne(P-3(2)) and of Ar, Kr, and N-2 by He(S-3(1)) using electron velocity map imaging (e-VMI) in a crossed molecular beam experiment. By controlling the beam velocities of both reactants, collision energies of 60 meV were obtained. The analysis of electron kinetic energy distributions provides insights into the internal state distribution of the ionic reaction products and the influence of vibrational or electronic excitation on the reaction outcome.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Engineering, Chemical
Alexandre Perdrau, Noemi Barros, Rocio Rincon, Herve Glenat, Stephanie Truong, Sarra Gam Derouich, Xiaonan Sun, Philippe Decorse, Sophie Nowak, Beatrice Plujat, Souad Ammar, Jean-Pascal Borra, Fiorenza Fanelli, Francoise Massines
Summary: This study focuses on metal/polymer nanocomposite thin films made by atmospheric pressure Plasma-Enhanced Chemical Vapor Deposition. The presence of NH3 influences the salt reduction and thin film properties. Various characterization techniques are used to analyze the aerosol and nanocomposite thin films. The results show that NH3 decreases the salt reduction, affects the size, concentration, and composition of the embedded nanoparticles, and changes the plasmonic response of the thin films.
PLASMA CHEMISTRY AND PLASMA PROCESSING
(2023)
Article
Chemistry, Physical
H. Dengel, A. Merz, M. W. Mueller, K. Gerard, M-W Ruf, H. Hotop
Summary: Ionization in thermal energy collisions between excited He*(2(1)S) and ground state Ar atoms leads to the formation of HeAr+ molecular ion states, with higher-lying levels subject to predissociation releasing kinetic energy.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Analytical
Moritz Hitzemann, Christoph Schaefer, Ansgar T. Kirk, Alexander Nitschke, Martin Lippmann, Stefan Zimmermann
Summary: In this paper, a new and easy to assemble dielectric barrier discharge plasma ionization source is presented, which is based on printed circuit boards with two parallel isolated electrodes for generating plasma inside an inert fused silica capillary. The plasma source is coupled to an ion mobility spectrometer for demonstration. Different ionization pathways can be achieved by whether the analytes pass through the plasma or bypass it before entering the reaction region of the ion mobility spectrometer. The plasma source has been designed using electric field simulations and can reach detection limits in the mid pptv range.
ANALYTICA CHIMICA ACTA
(2023)
Article
Physics, Fluids & Plasmas
Xiaotong Li, Zhenyu Tan, Xiaolong Wang, Yadi Liu
Summary: This study presents a numerical investigation on the evolution of temporal nonlinear behavior in an atmospheric pressure He/N-2 DBD with nitrogen content. The research revealed a complete evolution pathway of discharge modes with nitrogen content, showing chaotic discharge, period-doubling discharge, and asymmetric single-period discharge. Increasing nitrogen content leads to more uniform behavior of electron backflow and a stronger minor discharge through Penning ionization, impacting the evolution of discharge modes. Surface charges play a significant role in the evolution of discharge modes due to their contribution to seed electrons.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2022)
Article
Physics, Applied
Bolun Pang, Zhijie Liu, Sitao Wang, Yuting Gao, Huaiyan Zhang, Feng Zhang, Xiamin Tantai, Dehui Xu, Dingxin Liu, Michael G. Kong
Summary: This study investigates the transition of plasma jet modes from He to Ar by varying the Ar content in the working gas, observing significant differences in the production and delivery of reactive species into the liquid, leading to varying physicochemical properties and concentrations of reactive species in the plasma activated water (PAW). The inactivation effect against tumor cells, specifically A549 lung cancer cells, is found to be more efficient with Ar plasma jet induced PAW due to higher production of key species under filamentous mode.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Hamideh Hosseini, Mohammad Ghaffarzadeh
Summary: The treatment of liquid toluene in Ar/NH3 plasma generated by a dielectric barrier discharge (DBD) at ambient temperature and atmospheric pressure was studied. N-containing organic compounds and toluene-derived hydrocarbons were detected after plasma treatment, along with the presence of oxygenated organic compounds due to the residual oxygen in the plasma system.
Article
Chemistry, Multidisciplinary
Sen Li, Jiazhen Sun, Rui Sun, Jie Pan, Lin Wang, Chen Chen, Qiang Chen, Zhongwei Liu
Summary: This paper investigates the radio frequency dielectric barrier discharge using argon at atmospheric pressure. It observed alpha mode and gamma mode discharges, and analyzed the luminescence intensity at different locations in the discharge gap. It was found that in gamma mode, the negative glow appears with a delay of 13 +/- 1 ns compared to the electron avalanche in alpha mode.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Tobias Sixt, Taewon Chung, Frank Stienkemeier, Katrin Dulitz
Summary: In this study, the chemi-ionization of Li in the ground level 2(2)S(1/2) by He in a metastable state is investigated. It is found that the orbital of the valence electron of He plays a crucial role in the coupling strength of the collision complex to the ionization continuum. The results have implications for the improved understanding and control of chemi-ionization processes in merged beams and in traps.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Physics, Applied
Jie Yang, Zhaoquan Chen, Tao Dai, Sile Chen, Weiye Wang, Qingchun Su, Lu Zhang, Bing Wang, Yuming Zhou, Xinpei Lu
Summary: In this study, a dual-channel pulsed microwave coaxial resonant discharge device was constructed to generate atmospheric pressure pulsed microwave He plasma jet and spatially layered He/N-2 plasma jet. The spatiotemporal ionization evolution process of the He/N-2 plasma jet was determined in experiments. These results provide important references for better understanding the physical characteristics of gas plasma jets.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Physics, Applied
Antoine Belinger, Simon Dap, Nicolas Naude
Summary: This study focuses on a diffuse Dielectric Barrier Discharge (DBD) in atmospheric pressure air and investigates the influence of capacitance on the discharge regime. By modifying the dielectric capacitance and using electrical measurements, the effective surface and current density of the discharge were obtained. The results highlight the significance of controlling capacitance to achieve diffuse discharge at high frequency, which has potential applications in atmospheric pressure coating.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Analytical
Juan F. Ayala-Cabrera, Jasmin Turkowski, Florian Uteschil, Oliver J. Schmitz
Summary: A tube plasma ionization (TPI) open-air source for gas chromatography-mass spectrometry (GC-MS) was developed, and its ionization capabilities were tested using various analytes. Different discharge gases and auxiliary gases were investigated, along with the effects of adding water. Compared to other atmospheric pressure ionization sources, TPI showed a wider range of compound ionization and better detection capability.
ANALYTICAL CHEMISTRY
(2022)
Article
Physics, Fluids & Plasmas
Chen Zhou, Chengxun Yuan, Anatoly Kudryavtsev, T. Yasar Katircioglu, Ismail Rafatov, Jingfeng Yao
Summary: This study focuses on the numerical investigation of dielectric barrier discharge in atmospheric pressure CO2 in a coaxial reactor. Using a numerical model based on the drift-diffusion theory and considering gas heating in a self-consistent manner, the study examines the influence of gas heating on discharge properties and CO2 decomposition across a wide range of applied voltage amplitudes and frequencies. The calculations indicate that neglecting gas heating by assuming a constant (room) gas temperature leads to a significant overestimation of CO2 conversion.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
