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Ag Taispeaint Torthaí 26 - 50 de 3195 ar leathanach 2 de 128
Marcáilte
Marcáil
Real-time Plasma Controlled Chemistry in a Two-Frequency, Confined Plasma Etcher
(2008)
Milosavljevic, Vladimir; Ellingboe, Albert R; Gaman, Cezar; Ringwood, John V
Real-time Plasma Controlled Chemistry in a Two-Frequency, Confined Plasma Etcher
(2008)
Milosavljevic, Vladimir; Ellingboe, Albert R; Gaman, Cezar; Ringwood, John V
Achomaireacht:
<p>The physics issues of developing model-based control of plasma etching are presented. A novel methodology for incorporating real-time model-based control of plasma processing systems is developed. The methodology is developed for control of two dependent variables (ion flux and chemical densities) by two independent controls (27 MHz power and O2flow). A phenomenological physics model of the nonlinear coupling between the independent controls and the dependent variables of the plasma is presented. By using a design of experiment, the functional dependencies of the response surface are determined. In conjunction with the physical model, the dependencies are used to deconvolve the sensor signals onto the control inputs, allowing compensation of the interaction between control paths. The compensated sensor signals and compensated set–points are then used as inputs to proportional-integral-derivative controllers to adjust radio frequency power and oxygen flow to yield the desire...
http://arrow.dit.ie/schfsehart/191
Marcáilte
Marcáil
Development of Student Centred Physics Labs from Years 1 to 4
(2011)
Howard, Robert; Flynn, Cathal; Pedreschi, Francis
Development of Student Centred Physics Labs from Years 1 to 4
(2011)
Howard, Robert; Flynn, Cathal; Pedreschi, Francis
Achomaireacht:
<p>Physics laboratories, with their usual relaxed atmosphere combined with the exploratory nature of physics should help to create a student centred learning environment in which the students develop the necessary lab skills. However in reality most physics labs, especially in years 1 and 2, are recipe driven and the students follow a set of instructions from a manual which require no or minimal student exploration of the physics involved. The assessment methods also appear to be misaligned as they often only asses the product (report and logbooks) and not the desired learning outcomes of the module./p></p> <p>During this project we evaluated and re-aligned the learning outcomes, teaching and assessment methods for year 1 to 4 of the physics laboratory programmes. We found that although they were aligned on paper they were not aligned in practice. We developed a new suite of first year experiments which are more exploratory based and build the students’ skills s...
http://arrow.dit.ie/fellow/10
Marcáilte
Marcáil
Fit for purpose? Evaluation of an MSc. in Medical Physics.
(2014)
van der Putten, W J
Fit for purpose? Evaluation of an MSc. in Medical Physics.
(2014)
van der Putten, W J
Achomaireacht:
The National University of Ireland in Galway established a Master in Science (MSc.) program in medical physics in 2002. The course was designed to be 90 ECTS(1) credits and of one calendar year duration. From the outset the MSc. was designed to be part of an overall medical physics training program. MSc. programs are now widely used as part of the training and education of medical physicists. There is however paucity of data on the effectiveness of such courses and the purpose of the study reported here is to provide information on one particular MSc. course in medical physics. This is relevant to medical physicists who are involved in the development and running of medical physics training programs. The study used as methodology the Kirkpatrick levels of professional training. It was conducted through an online survey, both from students who graduated from the course and from students who were in the process of completing the course. The survey proved to be an effective way to dete...
http://hdl.handle.net/10147/322570
Marcáilte
Marcáil
Z-pinch Discharge in Laser Produced Plasma
(2010)
LUNNEY, JAMES; STERLING, ENRIQUE
Z-pinch Discharge in Laser Produced Plasma
(2010)
LUNNEY, JAMES; STERLING, ENRIQUE
Achomaireacht:
Z-pinch effects in a laser produced aluminium plasma were investigated with a relatively low current fast coaxial electrical discharge. The ion flux in the laser produced plasma (LPP) was monitored with a Langmuir ion probe and the line density was controlled by using an aperture to select the portion of the LPP which enters the discharge cell. The Zpinch dynamics were recorded using time-resolved imaging of the visible self-emission; the plasma was pinched to about one-third the initial radius. Both the laser and Z-pinch plasmas were diagnosed using time- and space-resolved spectroscopy; substantial heating was observed. The measured behaviour of the pinch was compared with the predictions of the slug model.
http://hdl.handle.net/2262/41045
Marcáilte
Marcáil
Concept mapping in physics in an Irish university: an investigation into the application of the tool with particular reference to its relevance to problem solving and the use of scientific language
(2010)
Broggy, Joanne
Concept mapping in physics in an Irish university: an investigation into the application of the tool with particular reference to its relevance to problem solving and the use of scientific language
(2010)
Broggy, Joanne
Achomaireacht:
Irish students’ interest and enjoyment of science deteriorates as they progress through formal education and subsequently enrolments in the physical sciences at second and third level education are low. Research in science education has identified reasons for the poor uptake of science subjects with attitude identified as a key factor (Regan, 2005; Smyth and Hannon, 2002). This thesis documents a research study in which Concept Mapping was introduced into a third level education physics classroom with the aim to improve students’ attitude towards Physics (Phase 1 and Phase 2). The research was developed further to investigate the role of Concept Mapping in analysing physics students’ use of scientific language when problem solving (Phase 3). Due to the diversity of the research questions a mixed-model methodology was employed incorporating both qualitative and quantitative research paradigms. The research participants employed in this action research study (longitudinal study) consi...
http://hdl.handle.net/10344/4554
Marcáilte
Marcáil
Collisionless heating in radio-frequency discharges: a review
(2009)
Turner, Miles M.
Collisionless heating in radio-frequency discharges: a review
(2009)
Turner, Miles M.
Achomaireacht:
Radio-frequency discharges are practically and scientifically interesting. A practical understanding of such discharges requires, among other things, a quantitative appreciation of the mechanisms involved in heating electrons, since this heating is the proximate cause of the ionization that sustains the plasma. When these discharges are operated at sufficiently low pressure, collisionless electron heating can be an important and even the dominant mechanism. Since the low pressure regime is important for many applications, understanding collisionless heating is both theoretically and practically important. This review is concerned with the state of theoretical knowledge of collisionless heating in both inductive and capacitive discharges.
http://doras.dcu.ie/14889/
Marcáilte
Marcáil
Electron and ion stagnation at the collision front between two laser produced plasmas
(2009)
Hough, Pádraig; McLoughlin, Conor; Kelly, Thomas J.; Hayden, Patrick; Harilal, Sivanand...
Electron and ion stagnation at the collision front between two laser produced plasmas
(2009)
Hough, Pádraig; McLoughlin, Conor; Kelly, Thomas J.; Hayden, Patrick; Harilal, Sivanandan S.; Mosnier, Jean-Paul; Costello, John T.
Achomaireacht:
We report results from a combined optical interferometric and spectrally resolved imaging study on colliding laser produced aluminium plasmas. A Nomarski interferometer was used to probe the spatio-temporal distribution of electron densities at the collision front. Analysis of the resulting interferograms reveals the formation and evolution of a localized electron density feature with a well-defined profile reminiscent of a stagnation layer. Electron stagnation begins at a time delay of 10 ns after the peak of the plasma generating laser pulse. The peak electron density was found to exceed 10^19 cm^−3 and the layer remained well defined up to a time delay of ca 100 ns. Temporally and spectrally resolved optical imaging was also undertaken, to compare the Al^+ ion distribution with that of the 2D electron density profile. This revealed nascent stagnation of singly charged ions at a delay time of 20 ns. We attribute these results to the effects of space charge separation in the seed p...
http://doras.dcu.ie/15134/
Marcáilte
Marcáil
Spectral distribution of atomic fluorescence coupled into an optical nanofibre
(2009)
Russell, Laura; Gleeson, Daniel A.; Minogin, Vladimir G.; Nic Chormaic, Síle
Spectral distribution of atomic fluorescence coupled into an optical nanofibre
(2009)
Russell, Laura; Gleeson, Daniel A.; Minogin, Vladimir G.; Nic Chormaic, Síle
Achomaireacht:
We analyse the lineshape of the fluorescence emitted by a cloud of optically excited cold atoms and coupled into an optical nanofibre. We examine the efficiency of the fluorescence coupling and describe the asymmetry of the lineshape caused by the redshifts arising from both the van der Waals and Casimir-Polder interaction of the atoms with the surface of the optical nanofibre. We compare the contributions of the van der Waals and Casimir-Polder redshifts and show that the lineshape of the fluorescence coupled into an optical nanofibre is, basically, influenced by the van der Waals redshift and is characterized by a long tail on the red side of the spectrum. We conclude that a measurement of the lineshape of the coupled fluorescence could be used to characterize the strength of the interaction of atoms with dielectric surfaces and for the detection of atoms using nanofibres.
http://hdl.handle.net/10468/361
Marcáilte
Marcáil
The new physics of non-equilibrium condensates: insights from classical dynamics
(2007)
EASTHAM, PAUL
The new physics of non-equilibrium condensates: insights from classical dynamics
(2007)
EASTHAM, PAUL
Achomaireacht:
We discuss the dynamics of classical Dicke-type models, aiming to clarify the mechanisms by which coherent states could develop in potentially non-equilibrium systems such as semiconductor microcavities. We present simulations of an undamped model which show spontaneous coherent states with persistent oscillations in the magnitude of the order parameter. These states are generalisations of superradiant ringing to the case of inhomogeneous broadening. They correspond to the persistent gap oscillations proposed in fermionic atomic condensates, and arise from a variety of initial conditions. We show that introducing randomness into the couplings can suppress the oscillations, leading to a limiting dynamics with a time-independent order parameter. This demonstrates that non-equilibrium generalisations of polariton condensates can be created even without dissipation. We explain the dynamical origins of the coherence in terms of instabilities of the normal state, and consider how it can a...
http://hdl.handle.net/2262/49379
Marcáilte
Marcáil
Influence of miscut direction on magnetic anisotropy of magnetite films grown on vicinal MgO (100)
(2010)
SHVETS, IGOR; ARORA, SUNIL; RAMOS, RAFAEL
Influence of miscut direction on magnetic anisotropy of magnetite films grown on vicinal MgO (100)
(2010)
SHVETS, IGOR; ARORA, SUNIL; RAMOS, RAFAEL
Achomaireacht:
Ferromagnetic resonance (FMR) was used to study the influence of miscut direction on the in-plane fourfold and uniaxial magnetic anisotropies of epitaxial Fe3O4 films grown on vicinal MgO (100) surfaces. In-plane angular dependent measurements at room temperature on Fe3O4 films on two different miscut directions (miscut along < 011 > and < 010 > directions) of MgO showed the presence of both in-plane fourfold (cubic) and in-plane uniaxial anisotropies. Temperature dependent FMR investigations show that the in-plane fourfold anisotropy constant (K-4) is approximately the same for both samples at room temperature. The magnitude of K-4 increases gradually with decreasing temperature and changes sign from negative to positive values at 130 K. This behavior is consistent with that of bulk magnetite. In addition to K-4, we find an additional uniaxial component (K-2), whose strength is quite different for the different miscut directions. The magnitude of K-2 shows very little o...
http://hdl.handle.net/2262/54949
Marcáilte
Marcáil
Pilot Scheme for Learning Support for 1st Year Experimental Physics
(2012)
Trappe, Neil
Pilot Scheme for Learning Support for 1st Year Experimental Physics
(2012)
Trappe, Neil
Achomaireacht:
Abstract included in text.
http://eprints.maynoothuniversity.ie/4312/
Marcáilte
Marcáil
Non-locality of non-Abelian anyons
(2009)
Brennen, G.K.; Iblisdir, S.; Pachos, J.K.; Slingerland, J.K.
Non-locality of non-Abelian anyons
(2009)
Brennen, G.K.; Iblisdir, S.; Pachos, J.K.; Slingerland, J.K.
Achomaireacht:
Entangled states of quantum systems can give rise to measurement correlations of separated observers that cannot be described by local hidden variable theories. Usually, it is assumed that entanglement between particles is generated due to some distance-dependent interaction. Yet anyonic particles in two dimensions have a nontrivial interaction that is purely topological in nature. In other words, it does not depend on the distance between two particles, but rather on their exchange history. The information encoded in anyons is inherently non-local even in the single subsystem level making the treatment of anyons nonconventional. We describe a protocol to reveal the non-locality of anyons in terms of correlations in the outcomes of measurements in two separated regions. This gives a clear operational measure of non-locality for anyonic states and it opens up the possibility to test Bell inequalities in quantum Hall liquids or spin lattices.
http://eprints.maynoothuniversity.ie/1878/
Marcáilte
Marcáil
Uniaxial stress studies of the Be pair bound exciton absorption spectrum in silicon
(1984)
Mulligan, F.J.; Henry, M.O.; Moloney, K.A.; Treacy, J.; Lightowlers, E.C.
Uniaxial stress studies of the Be pair bound exciton absorption spectrum in silicon
(1984)
Mulligan, F.J.; Henry, M.O.; Moloney, K.A.; Treacy, J.; Lightowlers, E.C.
Achomaireacht:
The authors report the results of preliminary uniaxial stress studies of the beryllium pair isoelectronic bound exciton absorption spectrum in silicon. The results confirm that the exciton behaves as an isoelectronic acceptor.
http://eprints.maynoothuniversity.ie/814/
Marcáilte
Marcáil
Real-time plasma control in a dual-frequency, confined plasma etcher
(2008)
Milosavljević, V.; Ellingboe, A.R.; Gaman, C.; Ringwood, John
Real-time plasma control in a dual-frequency, confined plasma etcher
(2008)
Milosavljević, V.; Ellingboe, A.R.; Gaman, C.; Ringwood, John
Achomaireacht:
The physics issues of developing model-based control of plasma etching are presented. A novel methodology for incorporating real-time model-based control of plasma processing systems is developed. The methodology is developed for control of two dependent variables (ion flux and chemical densities) by two independent controls (27 MHz power and O2 flow). A phenomenological physics model of the nonlinear coupling between the independent controls and the dependent variables of the plasma is presented. By using a design of experiment, the functional dependencies of the response surface are determined. In conjunction with the physical model, the dependencies are used to deconvolve the sensor signals onto the control inputs, allowing compensation of the interaction between control paths. The compensated sensor signals and compensated set–points are then used as inputs to proportional-integral-derivative controllers to adjust radio frequency power and oxygen flow to yield the desired ion fl...
http://eprints.maynoothuniversity.ie/6897/
Marcáilte
Marcáil
Variation of the electronic functionality of self-seeded germanium nanowires through synthesis determined core-shell interface states
(2015)
Connaughton, Stephen
Variation of the electronic functionality of self-seeded germanium nanowires through synthesis determined core-shell interface states
(2015)
Connaughton, Stephen
Achomaireacht:
THESIS 10692
Bottom up grown germanium nanowires may have an important role to play in future electronic devices. While the electrical properties of nanowires grown using a metallic seed as a catalyst have been extensively reported we study self-seeded nanowires in this thesis. Such wires are core-shell in nature and are grown without any intentional doping. Self-seeded nanowires have been previously proposed as an attractive alternative to conventionally grown wires due the alleviation of complications arising from unintentional doping from the metallic seed.
http://hdl.handle.net/2262/77547
Marcáilte
Marcáil
Computer simulation in low-temperature plasma physics: future challenges
(2016)
Turner, Miles M.
Computer simulation in low-temperature plasma physics: future challenges
(2016)
Turner, Miles M.
Achomaireacht:
Computer simulations can be carried out with various aims. Perhaps the most challenging is prediction under conditions where experiments are difficult or inaccessible, especially when failure to predict adequately may have unhappy consequences. There is, probably, not much confidence at present in the capability of low-temperature plasma physics simulations in such a context. Other fields have attempted to meet this challenge using a collection of techniques collectively known as Verification and Validation, or V&V. These are methods for enhancing confidence in the correctness and fidelity of computer simulations. This paper surveys these techniques and discusses their application to improvements of simulation capability in low-temperature plasma physics.
http://doras.dcu.ie/21802/
Marcáilte
Marcáil
Effects of excitonic diffusion on stimulated emission in nanocrystalline ZnO
(2006)
Tobin, Gerard; McGlynn, Enda; Henry, Martin O.; Mosnier, Jean-Paul; de Posada, Eduardo;...
Effects of excitonic diffusion on stimulated emission in nanocrystalline ZnO
(2006)
Tobin, Gerard; McGlynn, Enda; Henry, Martin O.; Mosnier, Jean-Paul; de Posada, Eduardo; Lunney, James G.
Achomaireacht:
We present optically-pumped emission data for ZnO, showing that high excitation effects and stimulated emission / lasing are observed in nanocrystalline ZnO thin films at room temperature, although such effects are not seen in bulk material of better optical quality. A simple model of exciton density profiles is developed which explains our results and those of other authors. Inhibition of exciton diffusion in nanocrystalline samples compared to bulk significantly increases exciton densities in the former, leading, via the nonlinear dependence of emission in the exciton bands on the pump intensity, to large increases in emission and to stimulated emission.
http://doras.dcu.ie/2/
Marcáilte
Marcáil
Single-shot characterization of independent femtosecond extreme ultraviolet free electron and infrared laser pulses
(2007)
Dardis, John; Kavanagh, Kevin D.; Pedregosa-Gutierrez, Jofre; Yeates, Patrick; Kennedy,...
Single-shot characterization of independent femtosecond extreme ultraviolet free electron and infrared laser pulses
(2007)
Dardis, John; Kavanagh, Kevin D.; Pedregosa-Gutierrez, Jofre; Yeates, Patrick; Kennedy, Eugene T.; Costello, John T.
Achomaireacht:
Two-color above threshold ionization of helium and xenon has been used to analyze the synchronization between individual pulses of the femtosecond extreme ultraviolet (XUV) Free electron LASer in Hamburg and an independent intense 120 fs mode-locked Ti:Sa laser. Characteristic sidebands appear in the photoelectron spectra when the two pulses overlap spatially and temporally. The cross-correlation curve points to a 250 fs r.m.s. jitter between the two sources at the experiment. A more precise determination of the temporal fluctuation between the XUV and infrared pulses is obtained through the analysis of the single-shot sideband intensities.
http://doras.dcu.ie/74/
Marcáilte
Marcáil
Photoionization experiments with the ultrafast EUV laser 'FLASH' - free electron laser in Hamburg
(2007)
Costello, John T.
Photoionization experiments with the ultrafast EUV laser 'FLASH' - free electron laser in Hamburg
(2007)
Costello, John T.
Achomaireacht:
The advent of mirror-less Free Electron Lasers emitting polarised and coherent 'laser-like' beams of high peak (> 1GW) and average (up to 100mW) powers in the extreme-UV (EUV) and X-ray bands of the electromagnetic spectrum heralds a new era in the study of the photoelectric effect. The unprecedented photon flux (~1013 photons per pulse) opens up to scrutiny processes with cross sections considered hitherto unfeasibly small to probe with conventional EUV sources such as synchrotrons and laser plasmas. The peak intensity of the focussed pulse train (<1013 W/cm2), combined with the high photon energy, ports non-linear optics and spectroscopy into a regime where inner shell electrons can become the predominant mediator of the photon matter interaction. Few photon, few electron photoionization processes are made amenable to study for the first time and the wavelength tunability of the FEL permits resonances to come into play. In combination with ultrafast optical lasers,...
http://doras.dcu.ie/111/
Marcáilte
Marcáil
Growth of CuCl thin films by magnetron sputtering for ultraviolet optoelectronic applications
(2006)
Natarajan, Gomathi; Daniels, Stephen; Cameron, David C.; O'Reilly, Lisa; Mitra, An...
Growth of CuCl thin films by magnetron sputtering for ultraviolet optoelectronic applications
(2006)
Natarajan, Gomathi; Daniels, Stephen; Cameron, David C.; O'Reilly, Lisa; Mitra, Anirban; McNally, Patrick J.; Lucas, Francis Olabanji; Rajendra Kumar, Ramasamy Thangavelu; Reid, Ian; Bradley, Ann Louise
Achomaireacht:
Copper (I) chloride (CuCl) is a potential candidate for ultraviolet (UV) optoelectronics due to its close lattice match with Si (mismatch less than 0.4%) and a high UV excitonic emission at room temperature. CuCl thin films were deposited using radio frequency magnetron sputtering technique. The influence of target to substrate distance (dts) and sputtering pressure on the composition, microstructure, and UV emission properties of the films were analyzed. The films deposited with shorter target to substrate spacing (dts=3 cm) were found to be nonstoichiometric, and the film stoichiometry improves when the substrate is moved away from the target (dts=4.5 and 6 cm). A further increase in the spacing results in poor crystalline quality. The grain interface area increases when the sputtering pressure is increased from 1.1×10–³ to 1×10–² mbar at dts=6 cm. Room temperature cathodoluminescence spectrum shows an intense and sharp UV exciton (Z₃) emission at ~385 nm with a full width at...
http://doras.dcu.ie/196/
Marcáilte
Marcáil
Electron heating mode transitions in dual frequency capacitive discharges
(2006)
Turner, Miles M.; Chabert, P.
Electron heating mode transitions in dual frequency capacitive discharges
(2006)
Turner, Miles M.; Chabert, P.
Achomaireacht:
The authors consider electron heating in the sheath regions of capacitive discharges excited by a combination of two frequencies, one much higher than the other. There is a common supposition that in such discharges the higher frequency is the dominant source of electron heating. In this letter, the authors discuss closed analytic expressions quantifying the Ohmic and collisionless electron heating in a dual frequency discharge. In both cases, the authors show that the lower frequency parameters strongly influence the heating effect. Moreover, this influence is parametrically different, so that the dominant heating mechanism may be changed by varying the low frequency current density.
http://doras.dcu.ie/213/
Marcáilte
Marcáil
Kinetic properties of particle-in-cell simulations compromised by Monte Carlo collisions
(2006)
Turner, Miles M.
Kinetic properties of particle-in-cell simulations compromised by Monte Carlo collisions
(2006)
Turner, Miles M.
Achomaireacht:
he particle-in-cell method with Monte Carlo collisions is frequently used when a detailed kinetic simulation of a weakly collisional plasma is required. In such cases, one usually desires, inter alia, an accurate calculation of the particle distribution functions in velocity space. However, velocity space diffusion affects most, perhaps all, kinetic simulations to some degree, leading to numerical thermalization (i.e., relaxation of the velocity distribution toward a Maxwellian), and consequently distortion of the true velocity distribution functions, among other undesirable effects. The rate of such thermalization can be considered a figure of merit for kinetic simulations. This article shows that, contrary to previous assumption, the addition of Monte Carlo collisions to a one-dimensional particle-in-cell simulation seriously degrades certain properties of the simulation. In particular, the thermalization time can be reduced by as much as three orders of magnitude. This effect mak...
http://doras.dcu.ie/214/
Marcáilte
Marcáil
Physics-Based Table-Top Mixed Reality Games
(2008)
Dong, Qingqing; Sun, Zhongyi; Mac Namee, Brian
Physics-Based Table-Top Mixed Reality Games
(2008)
Dong, Qingqing; Sun, Zhongyi; Mac Namee, Brian
Achomaireacht:
<p>Mixed reality applications use techniques from computer vision, augmented reality and virtual reality to allow real and virtual objects interact physically together on a user’s computer screen. This paper will describe two mixed reality applications which allow the user to play games that appear to take place on top of their physical desk. The games described are a desktop racing game and a desktop based game of ten pin bowling. In the desktop racing game virtual cars, controlled by the user, interact with both virtual objects (such as trees, walls and lampposts) and real ones (such as ramps and blocks). In the bowling game the player throws a real ball at a set of virtual bowling pins which react realistically as the ball appears to hit them. These initial games are being used as a springboard to investigate the core competencies required to make mixed reality games.</p>
http://arrow.dit.ie/scschcomcon/19
Marcáilte
Marcáil
Discourse on the interface of Matheatics and Physics: a panel discussion sponsored by DIT and the RIA.
(2006)
Goldsmith, Brendan
Discourse on the interface of Matheatics and Physics: a panel discussion sponsored by DIT and the RIA.
(2006)
Goldsmith, Brendan
Achomaireacht:
No abstract available
http://arrow.dit.ie/scschmatart/41
Marcáilte
Marcáil
Emission characteristics and dynamics of the stagnation layer in colliding laser produced plasmas
(2010)
Hough, Pádraig; McLoughlin, Conor; Harilal, Sivanandan S.; Mosnier, Jean-Paul; Costello...
Emission characteristics and dynamics of the stagnation layer in colliding laser produced plasmas
(2010)
Hough, Pádraig; McLoughlin, Conor; Harilal, Sivanandan S.; Mosnier, Jean-Paul; Costello, John T.
Achomaireacht:
The expansion dynamics of ion and neutral species in laterally colliding laser produced aluminum plasmas have been investigated using time and space resolved optical emission spectroscopies and spectrally and angularly resolved fast imaging. The emission results highlight a difference in neutral atom and ion distributions in the stagnation layer where, at a time delay of 80 ns, the neutral atoms are localized in the vicinity of the target surface 1 mm from the target surface while singly and doubly charged ions lie predominantly at larger distances, 1.5 and 2 mm, respectively. The imaging results show that the ions were found to form a well defined, but compressed, stagnation layer at the collision front between the two seed plasmas at early times (Dt ~ 80 ns). On the other hand, the excited neutrals were observed to form a V-shaped emission feature at the outer regions of the collision front with enhanced neutral emission in the less dense, cooler regions of the stagnation layer.
http://doras.dcu.ie/15135/
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