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Visar resultat 16 - 20 av 55 avhandlingar som matchar ovanstående sökkriterier.
16. Electron Wave Packet Dynamics on the Attosecond Time Scale
Sammanfattning : One objective of attosecond science is to study electron dynamics in atoms and molecular systems on their natural time scale. This can be done using attosecond light pulses. LÄS MER
17. Attosecond Sources and Interferometers - Developments and Applications
Sammanfattning : .... LÄS MER
18. Attosecond Optical and Electronic Wave Packets
Sammanfattning : When a low-frequency laser pulse is focused to a high intensity in a gas, the electric field of the laser may become comparable to, or even exceed, the electric field between the electrons and the nucleus in the atom. Under such conditions, through a process known as high-order harmonic generation, bursts of extreme ultraviolet radiation may be emitted, with durations in the attosecond domain (1 as = 10^{-18} s), which is the time-scale of electronic processes. LÄS MER
19. Time-Resolved Attosecond Spectroscopy of He Using COLTRIMS
Sammanfattning : Tunable ultrafast lasers are becoming a standard tool for probing and controlling the dynamics of atoms, molecules and chemical reactions. This thesis is a contribution to a large, ongoing effort to make spectroscopic tools for inducing and controlling, in real time, the natural processes which occur on the femto and attosecond times scales. LÄS MER
20. Measurement and Control of Attosecond Light Fields
Sammanfattning : Attosecond pulses are used to study electron dynamics in atoms and molecules. In this thesis, schemes to control the generation of attosecond pulses and pulse-shaping techniques to compress the pulses are presented. Generation of attosecond pulses requires high intensity, which is reached by focusing a pulsed femtosecond laser. LÄS MER
