Sökning: "Pump-Probe"

Visar resultat 16 - 20 av 71 avhandlingar innehållade ordet Pump-Probe.

  1. 16. Short Attosecond Pulse Trains at High Repetition Rates for Novel Pump-Probe and Coincidence Studies

    Författare :Sara Mikaelsson; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Attosecond; High-Order Harmonic Generation; Photoionization; Attosecond; High-Order Harmonic Generation; Photoionization; Fysicumarkivet A:2021:Mikaelsson;

    Sammanfattning : This work aims at studying photoionization dynamics from atoms and surfaces at attose time scales. The work was based on development and applications of a high repetition rate High-order Harmonic Generation (HHG) light source that utilizes Optical Parametric Amplification (OPA) laser technology. LÄS MER

  3. 17. The photophysics and functions of some naturally occurring carotenoids

    Författare :Helena Billsten; Kemisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physical chemistry; Fysikalisk kemi; xanthophyll-binding proteins; vibrational relaxation; light-harvesting complexes; carotenoid aggregates; carotenoids; excited states; femtosecond pump-probe spectroscopy; xanthophylls;

    Sammanfattning : Carotenoids are one of the most widespread and important group of pigments in Nature and they can act as light-harvesting agents, photoprotectors and antioxidants. Mechanisms of their multiple functions are not fully understood mainly because their complicated photophysics involving ?dark? excited states. LÄS MER

  4. 18. Experimental studies of dynamics in gas-phase diatomic molecules. From lifetime-measurements of BaF tofemtosecond pump-probe spectroscopy of Rb2

    Författare :Niklas Gador; KTH; []
    Nyckelord :ultrafast nonadiabatic dynamics Rb2;

    Sammanfattning : .... LÄS MER

  5. 19. Ultrafast Spectroscopy of Atomic and Molecular Quantum Dynamics

    Författare :Pia Johansson; Tony Hansson; Bertrand Girard; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemical physics; Kemisk fysik;

    Sammanfattning : An all-pervading feature of the work presented in this thesis is the study of ultrafast dynamics, both theoretically and experimentally, in terms of time-dependent wave functions (wave packets).We have experimentally, by pump-probe fluorescence spectroscopy, examined spin-orbit interactions, by time-tracing molecular wave packets on excited states of diatomic rubidium, and the main channels causing the fast predissociation from one of those states is revealed. LÄS MER

  7. 20. Electronic and Vibrational Coherence in Photosynthetic and Model Systems

    Författare :Mirianas Chachisvilis; Kemisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Kemi; Chemistry; Ultrafast relaxation; Porphyrins; Delocalization; Anisotropy; Wavepacket; Vibrational Coherence; Excitons; Electronic coherence; Energy transfer; Femtosecond spectroscopy; Photosynthesis;

    Sammanfattning : Ultrafast optical response and excitation energy dynamics in light harvesting pigment-protein complexes and in a few model systems have been studied both experimentally and theoretically. Femtosecond light pulses were employed to excite the system and monitor the subsequent time evolution of the transient absorption kinetics and anisotropy. LÄS MER