Search for dissertations about: "Ultrafast dynamics"

Showing result 1 - 5 of 62 swedish dissertations containing the words Ultrafast dynamics.

  1. 1. Superdiffusive Spin Transport and Ultrafast Magnetization Dynamics Femtosecond spin transport as the route to ultrafast spintronics

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Marco Battiato; Olle Eriksson; Hardy Gross; [2013]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Ultrafast magnetisation dynamics; anomalous diffusion; femtosecond dynamics; magnetism; Materialvetenskap; Materials Science;

    Abstract : The debate over the origin of the ultrafast demagnetization has been intensively active for the past 16 years. Several microscopic mechanisms have been proposed but none has managed so far to provide direct and incontrovertible evidences of their validity. READ MORE

  2. 2. Theoretical perspectives on ultrafast and non-linear spectroscopy

    University dissertation from Lund University, Faculty of Science, Department of Physics

    Author : Emil Vinas Boström; [2018-05-07]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Non-linear optics; Ultrafast dynamics; Non-equilibrium Green s functions; Density functional theory; Multi-photon absorption; Second harmonic generation; Desorption dynamics; Auger decay; Charge-separation dynamics; Quantum Zeno effect; Fysicumarkivet A:2018:Vinas Boström;

    Abstract : In this thesis we discuss a theoretical description of ultrafast and non-linear spectroscopy. Due to the high intensities and ultrashort pulse durations involved in such experiments, it is necessary to use an explicitly time-dependent formalism. READ MORE

  3. 3. Ultrafast Photo-induced Reaction Dynamics of Small Molecules

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Malin Kadi; Uppsala universitet.; [2003]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; pump-probe spectroscopy; reaction dynamics; photodissociation; aryl halides; spin-orbit coupling; ab initio calculations; molecular dynamics; vibrational wavepackets; Fysikalisk kemi; NATURAL SCIENCES Chemistry Physical chemistry; NATURVETENSKAP Kemi Fysikalisk kemi;

    Abstract : The main focus of this thesis is the investigation of the dissociation dynamics of aryl halides using femtosecond pump-probe spectroscopy. In the monohalogenated aryl halides, iodo-, bromo- and chlorobenzene, the rate of dissociation following excitation at 266 nm in the gas phase increased with increasing mass of the halogen atom. READ MORE

  4. 4. Structure and Dynamics in Transition Metal Perovskites — An Optical Spectroscopy Study

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Johan Bielecki; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; multiferroics; colossal magnetoresistance; magnetism; proton-conduction; spin-state transition; structure; Ultrafast spectroscopy; high temperature superconductivity; dynamics; Raman;

    Abstract : Transition metal oxides with the perovskite structure exhibit a vast number of exotic properties due to the large number of competing degrees of freedom at the Fermi surface. Together with couplings between and correlations within these degrees of freedom, this class of materials is of high interest from both a practical and theoretical point of view. READ MORE

  5. 5. Investigation of Ultrafast Molecular Dynamics via Covariance Mapping : A Tool for Intense XUV Light Sources

    University dissertation from Department of Physics, Lund University

    Author : Jan Lahl; [2019-03-04]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Covariance; Ultrafast; High-order harmonic generation; Extreme Ultraviolet; Pump probe; FLASH; Velocity map imaging; wavefront; FEL; photodissociation; Coulomb explosion; Fysicumarkivet A:2019:Lahl;

    Abstract : The study of molecular dynamics involves observations of the motion of nuclei and electrons. While nuclear motion is usually on the picosecond or femtosecond timescale, attosecond precision is necessary to directly observe the motion of electrons. READ MORE