Sökning: "attosecond physics"

Visar resultat 1 - 5 av 47 avhandlingar innehållade orden attosecond physics.

1. 1. Non-linear attosecond physics at 100 eV

   Författare :Alexander Muschet; Laszlo Veisz; Piotr Matyba; Per Eng-Johnsson; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; extreme ultraviolet XUV ; non-linear XUV – matter interaction; high-harmonic generation; photoionization; attosecond physics; isolated attosecond pulses; attosecond XUV pump – XUV probe spectroscopy; fysik; Physics;

   Sammanfattning : Non-linear interactions between light and matter have nowadays a broad range of applications. They are used for frequency doubling in simple laser pointers as well as for a variety of purposes in complex laser systems like the one presented in this thesis. LÄS MER

3. 2. Computing attosecond delays in atomic photoionisation : A non-iterative method for many-electron correlation within the Random Phase Approximation with Exchange

   Författare :Anton Ljungdahl; Eva Lindroth; Jon Grumer; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Random phase approximation with exchange; attosecond physics; attosecond delays; teoretisk fysik; Theoretical Physics;

   Sammanfattning : När en atom absorberar fotoner, i växelverkan med tillräckligt högenergetisktljus, så kan en (eller flera) av atomens elektroner ”sparkas ut”. Det resulterar i en positivt laddad jon och en (eller flera) så kallade fotoelektroner. Den här processen är känd som den fotoelektriska effekten, men kallas också för fotojonisering. LÄS MER

4. 3. Attosecond Electron Wave Packet Interferences

   Författare :Thomas Remetter; Atomfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Attosecond Bound Electron Wave Packet Dynamics; Attosecond Pulse Train; High-Order Harmonics; Electron Wave Packet Interferometry; Attosecond Physics;

   Sammanfattning : Attosecond pulses offer a new route to produce temporally localized electron wave packets (EWPs) that can easily be tailored by altering the properties of the attosecond pulses. In this thesis we will present different experiments, supported by theory, where attosecond EWPs are created in presence of a strong infrared (IR) field. LÄS MER

5. 4. Attosecond Wave Packet Metrology

   Författare :Marko Swoboda; Atomfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Molecular dissociation; Electron wave packets; Pulse characterization; Two-color harmonic generation; Attosecond pulse trains; Single attosecond pulses; Resonant two-photon ionization; Fysicumarkivet A:2010:Swoboda;

   Sammanfattning : Attosecond pulses allow the study of electrons on their natural timescale. They are created from the interaction of atoms with ultrashort, intense laser pulses whose electric field approaches the strength of inner-atomic electric fields. This thesis presents experiments around the generation, characterization and application of attosecond pulses. LÄS MER

7. 5. Attosecond information encoded in the photoemission angle

   Författare :Johanna Sörngård; Eva Lindroth; Jan-Petter Hansen; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; attosecond; photoemission; delay; circular polarization; angular dependence; asymmetry parameters; attosekund; fotoemission; fördröjning; cirkulärpolarisation; vinkelberoende; asymmetriparametrar; Theoretical Physics; teoretisk fysik;

   Sammanfattning : Electrons that break free during photoionization acquire a phase shift induced by the many-body potential of the parent ion. This phase shift can be interpreted as a delay in the photoionization process. LÄS MER