Search for dissertations about: "neon"

Showing result 1 - 5 of 21 swedish dissertations containing the word neon.

2. 1. Development of Experimental Methods, Data Analysis and Standards in Atomic Spectroscopy

   Author : Kasper Öberg; Astronomi - Genomgår omorganisation; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Atom- och molekylärfysik; Atomic and molecular physics; ytterbium; spectroscopy; radiative lifetimes; oscillator strengths; neon; line shapes; light sources; Fourier-transform spectroscopy; branching fractions; Stark effect; spectroscopic techniques; LIF; Atomic data;

   Abstract : The focus of this work is on the experimental techniques and data analysis in atomic spectroscopy. Improved methods for the analysis of spectra and the determination of level energies are presented. Most of these are based on a rigorous statistical treatment of the spectroscopic data. READ MORE

4. 2. Rare-gas Clusters Studied by Electron Spectroscopy : Structure of Heterogeneous Clusters and Effects of Electron Scattering on Auger Decay

   Author : Marcus Lundwall; Olle Björneholm; Gunnar Öhrwall; Maxim Tchaplyguine; Thomas Möller; Uppsala universitet; []
   Keywords : Physics; Nano-particles; Clusters; Heterogeneous clusters; Core-shell clusters; XPS; UPS; AES; Electron scattering; Radial structure; Surface structure; Surface sensitivity; Synchrotron radiation; Ne; Ar; Kr; Xe; Fysik;

   Abstract : In this Thesis experimental studies of nano-clusters using synchrotron radiation based photoelectron (UPS and XPS) and Auger Electron Spectroscopy (AES) are presented. The investigations may be divided into two parts where the first reports on the structure of heterogeneous two component clusters, and the second concerns electronic decay processes. READ MORE

5. 3. Attosecond photoelectron interferometry: from wavepackets to density matrices

   Author : Hugo Laurell; Atomfysik; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Quantum state tomography; Decoherence; Photoionization; Fysicumarkivet A:2023:Laurell;

   Abstract : Through the advent of high-order harmonic generation and attosecond light pulses, photoionization dynamics has been studied on the attosecond time-scale, the intrinsic time-scale of such dynamics. When the electron leaves the atomic potential a phase shift is imprinted on the electron wavefunction. READ MORE

6. 4. Time-Frequency Analysis in Attosecond Spectroscopy

   Author : Marcus Isinger; Atomfysik; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Attosecond; Spectroscopy; Time-Frequency; High-order harmonic generation; Rabitt; Interferometry;

   Abstract : This thesis deals with ultrafast dynamics of electronic processes in rare gas atoms. The processes we explore include photoemission, where we time the emission of electrons moving away from the atomic core following ionization by a photon; and auto-ionization, where the atom spontaneously releases an electron wave-packet following photo-excitation. READ MORE

7. 5. Development and characterization of damped cubic response functions with application to two-photon absorption

   Author : Tobias Fahleson; Patrick Norman; Joanna Kauczor; Linköpings universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

   Abstract : Molecular response to electromagnetic fields - static or optical - within a framework of perturbation theory diverges close to resonance with molecular transitionen energies, and need work-around solutions for real-valued response functions. This licentiate thesis deals with nonlinear response, with focus being on cubic polarizaibilities, and outlines the underlying mathematics for exact-state and approximatestate, complex-valued response functions applicable to quantum chemical computation. READ MORE