Timo Gans
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View article: Boron and phosphorus doped diamond: change in the electronic structure post exposure to low pressure deuterium plasma and its effect on the production of negative ions
Boron and phosphorus doped diamond: change in the electronic structure post exposure to low pressure deuterium plasma and its effect on the production of negative ions Open
Negative ion production is of significant interest for materials processing and neutral beam injection systems for magnetic confinement fusion reactors. The surface production mechanism can be required for high current applications. Dielec…
View article: Measuring negative ion yield and work function from phosphorus doped diamond, boron doped diamond, and graphite in deuterium plasmas
Measuring negative ion yield and work function from phosphorus doped diamond, boron doped diamond, and graphite in deuterium plasmas Open
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View article: Low-pressure inductively coupled plasmas in hydrogen: impact of gas heating on the spatial distribution of atomic hydrogen and vibrationally excited states
Low-pressure inductively coupled plasmas in hydrogen: impact of gas heating on the spatial distribution of atomic hydrogen and vibrationally excited states Open
Non-equilibrium inductively coupled plasmas (ICPs) operating in hydrogen are of significant interest for applications including large-area materials processing. Increasing control of spatial gas heating, which drives the formation of neutr…
View article: Surface production of negative deuterium ions from plasma-exposed boron doped diamond and graphite: work function measurements using photoemission yield spectroscopy
Surface production of negative deuterium ions from plasma-exposed boron doped diamond and graphite: work function measurements using photoemission yield spectroscopy Open
Negative-ion sources are of considerable interest for applications such as materials processing and neutral beam injection for magnetic confinement fusion. The efficient production of negative ions in these sources often relies on surface …
View article: Foundations of plasma standards
Foundations of plasma standards Open
The field of low-temperature plasmas (LTPs) excels by virtue of its broad intellectual diversity, interdisciplinarity and range of applications. This great diversity also challenges researchers in communicating the outcomes of their invest…
View article: Vibrational kinetics in repetitively pulsed atmospheric pressure nitrogen discharges: average-power-dependent switching behaviour
Vibrational kinetics in repetitively pulsed atmospheric pressure nitrogen discharges: average-power-dependent switching behaviour Open
Characterisation of the vibrational kinetics in nitrogen-based plasmas at atmospheric pressure is crucial for understanding the wider plasma chemistry, which is important for a variety of biomedical, agricultural and chemical processing ap…
View article: The 2021 release of the Quantemol database (QDB) of plasma chemistries and reactions
The 2021 release of the Quantemol database (QDB) of plasma chemistries and reactions Open
The Quantemol database (QDB) provides cross sections and rates of processes important for plasma models; heavy particle collisions (chemical reactions) and electron collision processes are considered. The current version of QDB has data on…
View article: Surface production of negative ions from pulse-biased nitrogen doped diamond within a low-pressure deuterium plasma
Surface production of negative ions from pulse-biased nitrogen doped diamond within a low-pressure deuterium plasma Open
The production of negative ions is of significant interest for applications including mass spectrometry, materials surface processing, and neutral beam injection for magnetic confined fusion. Neutral beam injection sources maximise negativ…
View article: Chemical kinetics and density measurements of OH in an atmospheric pressure He + O<sub>2</sub> + H<sub>2</sub>O radiofrequency plasma
Chemical kinetics and density measurements of OH in an atmospheric pressure He + O<sub>2</sub> + H<sub>2</sub>O radiofrequency plasma Open
This work presents experiments and modelling of OH densities in a radio-frequency driven atmospheric-pressure plasma in a plane-parallel geometry, operated in helium with small admixtures of oxygen and water vapour (He + O 2 + H 2 O). The …
View article: Reproducibility of ‘COST reference microplasma jets’
Reproducibility of ‘COST reference microplasma jets’ Open
Atmospheric pressure plasmas have been ground-breaking for plasma science and technologies, due to their significant application potential in many fields, including medicinal, biological, and environmental applications. This is predominant…
View article: Enhancing surface production of negative ions using nitrogen doped diamond in a deuterium plasma
Enhancing surface production of negative ions using nitrogen doped diamond in a deuterium plasma Open
The production of negative ions is of significant interest for applications including mass spectrometry, particle acceleration, material surface processing, and neutral beam injection for magnetic confinement fusion. Methods to improve the…
View article: Influence of surface materials on the volume production of negative ions in a radio-frequency driven hydrogen plasma
Influence of surface materials on the volume production of negative ions in a radio-frequency driven hydrogen plasma Open
Negative atomic hydrogen ion (H$^{-}$) densities were measured in a pulsed low-pressure E-mode inductively-coupled radio-frequency (rf) driven plasma in hydrogen by means of laser photodetachment and a Langmuir probe. This investigation fo…
View article: Helium metastable species generation in atmospheric pressure RF plasma jets driven by tailored voltage waveforms in mixtures of He and N<sub>2</sub>
Helium metastable species generation in atmospheric pressure RF plasma jets driven by tailored voltage waveforms in mixtures of He and N<sub>2</sub> Open
Spatially resolved tunable diode-laser absorption measurements of the absolute densities of He-I (2 3 S 1 ) metastables in a micro atmospheric pressure plasma jet operated in He/N 2 and driven by ‘peaks’- and ‘valleys’-type tailored voltag…
View article: Control of electron dynamics, radical and metastable species generation in atmospheric pressure RF plasma jets by Voltage Waveform Tailoring
Control of electron dynamics, radical and metastable species generation in atmospheric pressure RF plasma jets by Voltage Waveform Tailoring Open
Atmospheric pressure capacitively coupled radio frequency discharges operated in He/N 2 mixtures and driven by tailored voltage waveforms are investigated experimentally using a COST microplasma reference jet and by means of kinetic simula…
View article: Disrupting the spatio-temporal symmetry of the electron dynamics in atmospheric pressure plasmas by voltage waveform tailoring
Disrupting the spatio-temporal symmetry of the electron dynamics in atmospheric pressure plasmas by voltage waveform tailoring Open
Single frequency, geometrically symmetric Radio-Frequency (rf) driven atmospheric pressure plasmas exhibit temporally and spatially symmetric patterns of electron heating, and consequently, charged particle densities and fluxes. Using a co…
View article: Experimental and computational investigations of electron dynamics in micro atmospheric pressure radio-frequency plasma jets operated in He/N<sub>2</sub> mixtures
Experimental and computational investigations of electron dynamics in micro atmospheric pressure radio-frequency plasma jets operated in He/N<sub>2</sub> mixtures Open
The electron power absorption dynamics in radio frequency driven micro atmospheric pressure capacitive plasma jets are studied based on experimental phase resolved optical emission spectroscopy and the computational particle in cell simula…
View article: Corrigendum: Concepts and characteristics of the ‘COST Reference Microplasma Jet’ (2016 <i>J. Phys. D: Appl. Phys</i>. <b>49</b> 084003)
Corrigendum: Concepts and characteristics of the ‘COST Reference Microplasma Jet’ (2016 <i>J. Phys. D: Appl. Phys</i>. <b>49</b> 084003) Open
There is an incorrect representation of the expression for resistances in parallel in equation (1) in section 4.1 'Voltage probe calibration' on page 6. The numerator and denominator in the equation are reversed and should read: I = Uc Rm …
View article: Calculated electron impact dissociation cross sections for molecular chlorine (Cl<sub>2</sub>)
Calculated electron impact dissociation cross sections for molecular chlorine (Cl<sub>2</sub>) Open
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View article: The effect of photoemission on nanosecond helium microdischarges at atmospheric pressure
The effect of photoemission on nanosecond helium microdischarges at atmospheric pressure Open
Atmospheric-pressure microdischarges excited by nanosecond high-voltage\npulses are investigated in helium-nitrogen mixtures by first-principles\nparticle-based simulations that include VUV resonance radiation transport via\ntracing photon…
View article: Chemical kinetics in an atmospheric pressure helium plasma containing humidity
Chemical kinetics in an atmospheric pressure helium plasma containing humidity Open
Investigating the formation and kinetics of O and OH in a He–H2O plasma jet using absorption spectroscopy and 0D modelling.
View article: Numerical study of the influence of surface reaction probabilities on reactive species in an rf atmospheric pressure plasma containing humidity
Numerical study of the influence of surface reaction probabilities on reactive species in an rf atmospheric pressure plasma containing humidity Open
The quantification and control of reactive species (RS) in atmospheric pressure plasmas (APPs) is of great interest for their technological applications, in particular in biomedicine. Of key importance in simulating the densities of these …
View article: Controlled production of atomic oxygen and nitrogen in a pulsed radio-frequency atmospheric-pressure plasma
Controlled production of atomic oxygen and nitrogen in a pulsed radio-frequency atmospheric-pressure plasma Open
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View article: Absolute ozone densities in a radio-frequency driven atmospheric pressure plasma using two-beam UV-LED absorption spectroscopy and numerical simulations
Absolute ozone densities in a radio-frequency driven atmospheric pressure plasma using two-beam UV-LED absorption spectroscopy and numerical simulations Open
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View article: Controlling plasma properties under differing degrees of electronegativity using odd harmonic dual frequency excitation
Controlling plasma properties under differing degrees of electronegativity using odd harmonic dual frequency excitation Open
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View article: Experimental benchmark of kinetic simulations of capacitively coupled plasmas in molecular gases
Experimental benchmark of kinetic simulations of capacitively coupled plasmas in molecular gases Open
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View article: Investigation of the radially resolved oxygen dissociation degree and local mean electron energy in oxygen plasmas in contact with different surface materials
Investigation of the radially resolved oxygen dissociation degree and local mean electron energy in oxygen plasmas in contact with different surface materials Open
Energy Resolved Actinometry is applied to simultaneously measure the radially resolved oxygen dissociation degree and local mean electron energy in a low-pressure capacitively coupled radio-frequency oxygen plasma with an argon tracer gas …
View article: The role of thermal energy accommodation and atomic recombination probabilities in low pressure oxygen plasmas
The role of thermal energy accommodation and atomic recombination probabilities in low pressure oxygen plasmas Open
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View article: Power coupling mode transitions induced by tailored voltage waveforms in capacitive oxygen discharges
Power coupling mode transitions induced by tailored voltage waveforms in capacitive oxygen discharges Open
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View article: Concepts, Capabilities, and Limitations of Global Models: A Review
Concepts, Capabilities, and Limitations of Global Models: A Review Open
For researchers wishing to generate an understanding of complex plasma systems, global models often present an attractive first step, mainly due to their ease of development and use. These volume averaged models are able to give descriptio…