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The interaction of ionising radiation with atomic and/or molecular ions is a fundamental process in nature, with implications for the understanding of many laboratory and astrophysical plasmas. At short wavelengths, the photon–ion interactions lead to inner-shell and multiple electron excitations, leading to demands on appropriate laboratory developments of sources and detectors and requiring advanced theoretical treatments which take into account many-body electron-correlation effects. This book includes a range of papers based on different short wavelength photon sources including recent facility and instrumental developments. Topics include experimental photoabsorption studies with laser-produced plasmas and photoionization of atomic and molecular ions with synchrotron and FEL sources, including modifications of a cylindrical mirror analyzer for high efficiency photoelectron spectroscopy on ion beams. Theoretical investigations include the effects of FEL fluctuations on autoionization line shapes, multiple sequential ionization by intense fs XUV pulses, photoelectron angular distributions for non-resonant two-photon ionization, inner-shell photodetachment of Na- and spin-polarized fluxes from fullerene anions.
2s2p --- Lithium-ion --- auto-ionization --- free electron laser --- stochastic average --- time dependent density matrix --- photoionization --- multiple ionization --- many-electron processes --- absolute cross sections --- synchrotron radiation --- collisional-radiative model --- laser-produced plasma, ion distribution --- ionization bottleneck --- radiative recombination --- collisional ioniztion --- three-body recombination --- nonlinear photoionization --- nonlinear interaction --- Cooper minimum --- angular distributions --- atomic ions --- dual-laser plasma technique --- photodetachment --- inner-shell phenomena --- electron spectroscopy --- ion beam --- spin-polarization --- fullerene anions --- endohedral fullerene anions --- NH+ --- molecular ion --- K-shell --- merged-beam --- Pb-Sn alloys --- EUV emission of high Z materials --- collisional radiative model --- Cowan suite of Codes --- ions --- free-electron laser --- krypton --- femtosecond pulses --- photoelectron spectroscopy --- atomic data --- inner-shell photoionization --- atomic nitrogen ion --- n/a
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This book is intended to provide an overview of the state-of-the-art in specialty photonic crystal fiber technology and its multiple applications, combined with an optimistic outlook to what lies ahead. It comprises six original research papers and one review from different leading research institutions worldwide.
stimulated Raman scattering --- hollow-core photonic crystal fibers --- fiber lasers --- gas lasers --- hollow-core photonic crystal fiber --- soliton --- photoionization --- dispersive wave --- chalcogenide glasses --- 3D printing --- mid-infrared fibers --- photonic crystal fibers --- photonic bandgap fiber --- resonance --- dispersion management --- supercontinuum generation --- photonic crystal fiber --- polarization modulation instability --- ANDi fiber --- liquid-filled PCF --- hollow core fiber --- optical waveguide design --- mid-infrared beam delivery --- hollow-core fiber --- fiber gas laser --- n/a
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Positrons can be used to study metallic defects. Positron annihilation experiments have been carried out to identify the defects in complex oxides. Positrons have also been used to study the Bose–Einstein condensation (BEC). Ps-BEC can be used to measure antigravity using atomic interferometers. This Special Issue hopes to bring awareness of the various aspects of positron interactions to the larger physics communities. We invite authors to submit articles from all areas of physics.
photoionization --- photoabsorption --- photodetachment --- positronium negative ion --- Feshbach and shape resonance states --- correlated exponential wave functions --- complex-coordinate rotation method --- positron-impact excitation --- variational polarized orbital method --- Born approximation --- Coulomb-dipole theory --- positron vs. electron impact ionization --- antihydrogen --- radiative attachment --- antihydrogen ion --- analytical --- hydrogen ion --- solar flares --- coronal mass ejections --- shocks --- positrons --- positronium --- positron annihilation --- pion decay --- autoionization states --- doubly excited states --- Feshbach states --- resonances --- shape resonances --- electron-impact ionization --- hydrogen --- positron-impact ionization --- velocity field --- vortices --- Electron-Positron Scatterings --- atoms and molecules --- cross sections and spin polarization --- theoretical approaches --- Stark effects --- Gailitis resonance --- LENR --- muon catalyzed fusion --- free–free transitions --- opacity
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The last two decades have witnessed a rapid development of microelectromechanical systems (MEMS) involving gas microflows in various technical fields. Gas microflows can, for example, be observed in microheat exchangers designed for chemical applications or for cooling of electronic components, in fluidic microactuators developed for active flow control purposes, in micronozzles used for the micropropulsion of nano and picosats, in microgas chromatographs, analyzers or separators, in vacuum generators and in Knudsen micropumps, as well as in some organs-on-a-chip, such as artificial lungs. These flows are rarefied due to the small MEMS dimensions, and the rarefaction can be increased by low-pressure conditions. The flows relate to the slip flow, transition or free molecular regimes and can involve monatomic or polyatomic gases and gas mixtures. Hydrodynamics and heat and mass transfer are strongly impacted by rarefaction effects, and temperature-driven microflows offer new opportunities for designing original MEMS for gas pumping or separation. Accordingly, this Special Issue seeks to showcase research papers, short communications, and review articles that focus on novel theoretical and numerical models or data, as well as on new experimental results and technics, for improving knowledge on heat and mass transfer in gas microflows. Papers dealing with the development of original gas MEMS are also welcome.
preconcentrator --- UV absorption --- n/a --- bearing characteristics --- ultraviolet light-emitting diode (UV LED) --- resonant micro-electromechanical-systems (MEMS) --- heat sinks --- measurement and control --- flow choking --- mixing length --- gas flows in micro scale --- BTEX --- kinetic theory --- PID detector --- ethylbenzene and xylene (BTEX) --- computational fluid dynamics (CFD) --- OpenFOAM --- direct simulation Monte Carlo (DSMC) --- thermally induced flow --- vacuum micropump --- miniaturization --- gaseous rarefaction effects --- modelling --- volatile organic compound (VOC) detection --- supersonic microjets --- slip flow --- Nano-Electro-Mechanical Systems (NEMS) --- micro-mirrors --- micro-scale flows --- microfabrication --- Knudsen pump --- microfluidic --- microfluidics --- hollow core waveguides --- capillary tubes --- gas mixing --- advanced measurement technologies --- DSMC --- Micro-Electro-Mechanical Systems (MEMS) --- microchannels --- miniaturized gas chromatograph --- Pitot tube --- multi-stage micromixer --- analytical solution --- pressure drop --- micro-mixer --- thermal transpiration --- photoionization detector --- FE analysis --- gas mixtures --- spectrophotometry --- Knudsen layer --- pulsed flow --- Fanno flow --- integrated micro sensors --- binary gas mixing --- modified Reynolds equation --- rarefied gas flow --- rarefied gas flows --- backward facing step --- modular micromixer --- fractal surface topography --- underexpansion --- electronic cooling --- splitter --- compressibility --- photolithography --- Benzene --- out-of-plane comb actuation --- gas sensors --- aerodynamic effect --- fluid damping --- toluene --- control mixture composition
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