Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"XUV"”.
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Table-top XUV nanoscope
… development of a table-top extreme-ultraviolet (XUV) nanoscope suitable for coherent diffractive imaging (CDI). Intense spatially coherent ultrashort XUV and X-ray pulses are desired for nanoscale biological and material imaging. Such radiation can be produced via high harmonic generation (HHG) …
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XUV probing of warm dense matter
… decompress, it was then probed using an XUV beam generated by HHG from a 1.5ps optical laser, with photon energies of 21eV, 26eV and 31eV. This XUV beam propagated to a grating spectrometer, which allowed the opacity of each sample foil to be measured at multiple photon energies …
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Development and characterization of XUV xenon laser
… research is to develop and improve a practical XUV Xe laser, and to use it for XUV holographic imaging. Measurements on gain lifetime values of this laser have been performed. The laser has been found to have gain lifetime around 250 psec to 350 psec under our experimental conditions, and thus …
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Photoionization of atoms with ultrashort XUV laser pulses at extreme intensities
… of atoms exposed to high intense and ultrashort XUV-laser pulses of free-electron lasers. In particular, the influence of coherent dynamics of the electrons as well as the electron-electron interaction are in focus of this survey and the resulting signatures as Rabi oscillations and …
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Dye-sensitized cobalt cubane: ultrafast photophysics probed by transient XUV spectroscopy
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Ankunftszeitbestimmung ultrakurzer XUV Pulse von FLASH durch Kreuzkorrelation mit ultrakurzen NIR Pulsen
… (a few tens of fs) extreme-ultraviolet (XUV) pulses with photon energies up to 200 eV, peak powers at the gigawatt level, unprecedented average and peak brilliance and a high degree of transverse coherence. In combination with an electronically synchronized fs NIR laser, pump-probe …
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The Development of a Novel Femtosecond Xuv Light Source to Do Spectroscopy of Atoms and Molecules.
Technological advances in ultrafast lasers has allowed light with pulsewidths less than 100 femtoseconds and an incredible high intensity ( I >1017 watts/cm2) to be obtained. When an atomic or molecular medium is exposed to such an intense field, the interaction between the medium and the field is …
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Transient extreme ultraviolet spectroscopy of semiconductors
Transient extreme ultraviolet (XUV) spectroscopy is used to investigate ultrafast photophysics in lead iodide (PbI2) and methylammonium lead iodide perovskite (MAPbI3). Sub-30 fs pulses of XUV light are produced to use as a probe in a tabletop instrument using high-harmonic generation. PbI2 and …
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Development of solution-phase extreme ultraviolet spectroscopy and photophysics of μ-oxo-bridged Fe(III)porphyrins
… to operate in the vacuum conditions needed for XUV transmission. Gas-generated liquid sheet of chlorinated solvents transmissible to XUV photons are characterized and stabilized under vacuum conditions. A method for measuring the thickness of a liquid sheet in situ is described and the …
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Dissociation dynamics of diatomic molecules in intense fields
… of diatomic molecules (dimers) in intense IR and XUV laser fields theoretically and compare the results with measured data in collaboration with different experimental groups worldwide. The first three chapters of the thesis cover the introduction and the background on solving time-independent and …
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Photoelectron Spectroscopy of highly oriented pyrolytic graphite using intense ultrashort laser pulses
… with photoelectron spectra taken using XUV pulse trains show a striking resemblance suggesting that the same final states excited by multiple IR pulses can also be reached by a single XUV photon. Interferometric autocorrelation measurements of the photoemission signal show increasingly …
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Ultrafast photophysics of transition metal coordination complexes studied with femtosecond extreme ultraviolet transient absorption spectroscopy
… studied using a homebuilt extreme ultraviolet (XUV) transient absorption apparatus. XUV photons are produced via high-harmonic generation, allowing M-edge XANES measurements to be performed as an in-lab technique. This developing technique is coupled with semi-empirical ligand field multiplet …
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Modelling of capillary high harmonic generation
… method for laboratory based generation of XUV and soft x-ray light. HHG produces pulses that are highly coherent, with a pulse length in the femtosecond or attosecond timescales. To predict the XUV output from an HHG experiment, both the emission from a single atom and the build-up of …
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Developing A Toolbox To Probe Reaction Dynamics With Strong Field Ionization And Non-Linear Attosecond Spectroscopy
… measurements of the double ionization event of XUV-pump-XUV-probe system for the first time. The extended studies will be carried out with the combination of our newly developed 3D detector to this current setup which will facilitate the triple coincidence capabilities.</p>
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The femtosecond m-edge approach to the photodynamics of iron(II) complexes
… (L2,3-edge XAS) or extreme ultraviolet light (XUV, M2,3-edge XAS) is particularly sensitive to the metal-centered electronic structure. Innovations in ultrafast light sources in the soft X-ray and XUV energy ranges, particularly via high-harmonic generation (HHG), allow short-lived states to be …
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Dynamics of single clusters in intense light pulses studied with ion spectroscopy and light scattering
… wurden Cluster mit extrem-ultravioletter (XUV) Strahlung des FLASH-FEL in Hamburg abgebildet, sowie laserinduzierte Prozesse in der Probe mit infraroten (IR) Pulsen untersucht. Für die Experimente wurden ein Fokussier- und ein motorisiertes, vakuumtaugliches Einkoppelsystem entworfen und …
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Towards High-Flux Isolated Attosecond Pulses with a 200 TW CPA
… as). Unfortunately, these extreme ultraviolet (XUV) pulses by themselves contain too few photons to initiate nonlinear dynamics or dress states in an attosecond pump--attosecond probe scheme. As a result, most attosecond experiments thus far have featured complementary near infrared (NIR) …
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Rare-gas clusters in intense VUV laser fields
… attosecond pulses in the extreme ultra-violet (XUV) are used to probe the transient charging of the cluster ions during the interaction with the laser by measuring the kinetic energy of the electrons detached by the probe pulse. This information is otherwise lost at later times due to …
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The stability of short-period extrasolar giant planets
… is heated by the absorption of EUV and X ray (XUV) radiation emitted by the host star. The radiation also ionises the neutral species in the upper atmosphere, which is expected to be composed mainly of molecular and atomic hydrogen, and atomic helium. Ionisation and subsequent photochemistry …
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