Search for dissertations about: "Helium spectroscopy"
Showing result 1 - 5 of 21 swedish dissertations containing the words Helium spectroscopy.
-
1. Time-Frequency Analysis in Attosecond Spectroscopy
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
-
2. Inside Pulsating White Dwarfs: Clues from time-resolved spectroscopy
Abstract : Several analyses using time-resolved optical spectrocopy of pulsating white dwarfs are presented. The data have been put to a number of uses. First, line-of-sight velocities associated with the pulsations have been measured in three hydrogen-atmosphere white dwarfs (DAVs), bringing the total number of such measurements up to five. READ MORE
-
3. Soft X-ray Scattering Dynamics Close to Core Ionization Thresholds in Atoms and Molecules
Abstract : In this Thesis studies of highly excited states in gas-phase atoms and molecules (He, Ne, N2, O2, N2O and CO2) using a variety of synchrotron-radiation based techniques are presented. The three techniques used most frequently are X-ray-emission-threshold-electron coincidence (XETECO), X-ray emission spectroscopy (XES) and X-ray photoelectron spectroscopy (XPS) and they are all given a brief introduction. READ MORE
-
4. Spectral Analysis of Neutron Capture Elements in the Laboratory and Stars
Abstract : The pedigree of the elements heavier than iron is a vital question in the history and evolution of our galaxy. The elements up to and including those of the iron group are produced mainly through fusion processes within stars, giving the stars their energy. READ MORE
-
5. Cerium as a quantum state probe for rare-earth qubits in a crystal
Abstract : Rare-earth ions doped into a transparent crystal can have optically excited states with coherence times of milliseconds and hyperfine levels with coherence times of hours when cooled down to liquid helium temperatures. This makes them attractive for developing quantum computing hardware. READ MORE