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 12 of 12 for “"double ionization"”.
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Experimental examination of ionization processes of noble gases in strong laser fields
… high number of photons available, allows the ionization of noble gas atoms by absorption of a great number of IR-photons, whose individual energy is much smaller than the atom s ionization potential. Alternatively, the interaction may be described in terms of fields: The laser modifies the …
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Developing A Toolbox To Probe Reaction Dynamics With Strong Field Ionization And Non-Linear Attosecond Spectroscopy
… to the laser matter interaction: strong field ionization and nonlinear attosecond spectroscopy. The first part is based on the studies related to the strong field ionization probe. Strong field ionization probe was verified to be sensitive to the sign of magnetic quantum number which evident …
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PIC simulation of a ceramic-lined Hall-effect thruster
… 3kW SPT thruster. This code treats single and double ions, neutrals and electrons as particles, moved forward by a leapfrog algorithm at each timestep, matching the lowest of the plasma and the cyclotron times. At the end of each timestep, a successive-over-relaxation algorithm solves the …
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Photoionization of atoms with ultrashort XUV laser pulses at extreme intensities
The present thesis is concerned with the photoionization dynamics 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 …
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Numerische Simulationen zur Einfach- und Doppelionisation von H2 in kurzen intensiven Laserpulsen
Rescattering is the dominant process leading to double ionization in atoms and molecules interacting with linearly polarized laser pulses with wavelengths around 800 nm and in an intensity regime of 10^14 to 10^15 W/cm². Using numerical integrations of the two-electron Schrödinger equation of the …
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Πολυφωτονική φασματοσκοπία του Sr-αυτοϊονιζόμενες καταστάσεις με J=3 και διπλός ιονισμός
… We have recorded energy level positions and autoionization widths of the odd pavity J=3 states of Sr, in the energy range. Between the 5S1/2 and 4D3/2, 5/2 ionization limits. The analysis of the spectra showed that strong perturbations exist among Rydberg series converging in different limits. B) …
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Fundamental Studies And Applications Of Strong Field Ionization
… field, atoms and molecules experience tunneling ionization directly to the continuum. We used this method to study several aspects and applications of strong field ionization (SFI) in atoms and molecules. One study used SFI to probe the photofragments produced by photodissociation using DC sliced …
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Determination of the ion distribution function during magnetic reconnection in the versatile toroidal facility with a gridded energy analyzer
… with a theoretical fit constructed from a double Maxwellian distribution, from which the temperatures and drift velocities are found as functions of space and time. It is found that the ion temperature of each Maxwellian exhibit minor temporal variations during reconnection which are …
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Non-Hermitian Perturbation Theory for the Electronic Decay of Excited and Ionized Molecules and Identification of the Electronic Decay Processes in the Auger Decay of Core-Ionized Xenon Fluorides
… decay processes are identified by comparing the ionization spectra of the singly ionized molecule with its double ionization spectra. Electronic decay processes of interatomic character are found to have considerable impact on the electronic decay width in the xenon fluorides, due to a relation …
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Studies of the dissociation and energetics of gaseous ions
In this thesis the electron ionization of a number of small gas phase molecules is investigated using pulsed time-of-flight mass spectrometry coupled with a 2-D ion coincidence technique. The simultaneous acquisition of conventional TOF mass spectra and ion coincidence mass spectra, enables …
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Adaptive control of electronic excitation utilizing ultrafast laser pulses
… an electronic excitation, and subsequently their ionization, photofragmentation or isomerization. The specific adjustment of the excitation laser field properties offers the possibility to manipulate the induced electronic excitation and to influence the formation of the associated photoproducts. …
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Atomare Zweielektronensysteme in intensiven Laserpulsen
Durch die stetige Weiterentwicklung der Lasertechnologie ist es in den <br>letzten Jahren möglich geworden, die fundamentale Wechselwirkung <br>hochintensiver Lichtfelder mit komplexen Atomen und Molekülen zu untersuchen. <br>Dabei haben Experimente im Tunnelbereich gezeigt, <br>daß die …