Sökning: "multi-photon process"
Visar resultat 1 - 5 av 7 avhandlingar innehållade orden multi-photon process.
1. Theory of inelastic tunneling : applications to double-barrier structures and scanning tunneling microscopes
Sammanfattning : .... LÄS MER
2. Multi-photon microscopy enhanced: Exploring annular beams and gold nano-particles for improved imaging
Sammanfattning : Laser scanning multiphoton microscopy (MPM) has emerged as a powerful tool for non-invasive three-dimensional imaging of biological tissue. The localized focal region enables confocality without the use of a physical pinhole while providing less photobleaching and photodamage compared to confocal laser scanning microscopy. LÄS MER
3. Quantum chemical calculations of non-linear optical absorption
Sammanfattning : This thesis represents a quantum chemical treatise ofvarious types of interactions between radiation and molecularsystems, with special emphasis on the nonlinear opticalprocesses of Multi-Photon Absorption and Excited StateAbsorption. Excitation energies, transition dipole moments,two-photon and three-photon tensor elements have beencalculated from different approaches; density functional theoryandab-initiotheory, employing different orders ofcorrelation treatment with the purpose to provide accuratevalues as well as evaluate the quality of the lower ordermethods. LÄS MER
4. Theoretical perspectives on ultrafast and non-linear spectroscopy
Sammanfattning : 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. LÄS MER
5. Ultrafast Structural Changes in a Bacterial Photosynthetic Reaction Center probed with XFEL Radiation
Sammanfattning : Photosynthesis is the process by which plants and many species of bacteria convert energy from sunlight into chemical energy used to power their metabolism. As these plants and bacteria are eaten, the chemical energy moves up the food chain and thus photosynthesis provides fuel for almost all life on Earth. LÄS MER