Search for dissertations about: "direct double ionization"

Showing result 1 - 5 of 7 swedish dissertations containing the words direct double ionization.

  1. 1. Single-photon multiple ionization processes studied by electron coincidence spectroscopy

    University dissertation from Stockholm : Department of Physics, Stockholm University

    Author : Per Linusson; Mats Larsson; Raimund Feifel; Stephen Price; [2013]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; photoionization; multiple ionization; autoionization; synchrotron radiation; electron coincidence spectroscopy; Physics; fysik;

    Abstract : This thesis is based on studies of multiple ionization of atoms and molecules induced by the absorption of a single photon. For the experimental investigations a time-of-flight magnetic bottle spectrometer has been used to detect the emitted electrons in coincidence. READ MORE

  2. 2. Ultra-fast dynamics in atoms and molecules during photoionization: from attoseconds to femtoseconds

    University dissertation from Division of Synchrotron Radiation Research, Department of Physics, Lund University

    Author : Erik Månsson; [2014]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; photoelectron spectroscopy; momentum imaging; coincident detection; correlation; direct double ionization; Born–Oppenheimer approximation; high harmonics; synchrotron radiation; Fysicumarkivet A:2014:Månsson;

    Abstract : Treating the correlated behaviour of multiple particles is challenging for both theory and experiment. This thesis reports on a variety of experimental investigations aiming to advance the understanding of fundamental processes in atoms and molecules: double ionization, isomerization and dissociation. READ MORE

  3. 3. Dissociation dynamics of highly excited molecules: Theory and Experiment

    University dissertation from Lund University, Faculty of Science, Department of Physics, Division of Synchrotron Radiation Research

    Author : Shabnam Oghbaie; [2017]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Molecular dissociation; core-electron excitation; double ionization; femtoseconds molecular dynamics; Isomerization; symmetry breaking; momentum imaging; site-selective dissociation; butadiene; cyclopropane; nuclear dynamics; Auger decay;

    Abstract : This thesis presents studies on dissociation of two model molecules: Butadiene and Cyclopropane. Tunable synchrotron radiation was used to ionize or excite the molecules in the gas phase, and the momentum correlation of the resulting fragment ions were measured using a 3D momenta coincident ion spectroscopy. READ MORE

  4. 4. Multi-Electron Coincidence Studies of Atoms and Molecules

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Egil Andersson; Raimund Feifel; Jan-Erik Rubensson; Kiyoshi Ueda; [2010]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; multi-ionization; electron emission; time-of-flight spectroscopy; coincidence spectroscopy; core-valence ionization; synchrotron radiation; electron correlation; NATURAL SCIENCES Physics Atomic and molecular physics; NATURVETENSKAP Fysik Atom- och molekylfysik; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Abstract : This thesis concerns multi-ionization coincidence measurements of atoms and small molecules using a magnetic bottle time-of-flight (TOF) spectrometer designed for multi-electron coincidence studies. Also, a time-of-flight mass spectrometer has been used together with the TOF electron  spectrometer for electron-ion coincidence measurements. READ MORE

  5. 5. Double Inner-Shell Vacancies in Molecules

    University dissertation from Göteborgs universitet

    Author : Dimitris Koulentianos; Göteborgs universitet.; Gothenburg University.; [2019]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Molecular electronic states possessing a double core-vacancy, referred to as double-core-hole (DCH) states, were predicted more than thirty years ago, to have interesting properties, which would allow one to probe matter in a much more detailed way compared to conventional single core-vacancy techniques. Though DCH states are characterized by low cross-sections compared to the dominant single-core-hole (SCH) states, which implies experimental challenges, the development of third generation synchrotron radiation (SR) facilities and X-ray free electron lasers (XFEL), in combination with advanced spectroscopy techniques, resulted recently in a significant number of scientific works reporting on the observation of different types of DCH states. READ MORE