Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"Femtosecond Spectroscopy"”.
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Femtosecond optical pulse shaping and multiple-pulse femtosecond spectroscopy
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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Femtosecond spectroscopy of coherent phenomena in quantum materials : a dissertation
Quantum materials are solids that cannot be described by the single-particle band models of conventional condensed matter physics. Rather strong inter-particle interactions and coupling between various degrees of freedom (charge, spin, orbital and lattice) lead to emergent phases such as …
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Frequency-resolved ultrafast dynamics of phonon polariton wavepackets in the ferroelectric crystals LiNbO₃ and LiTaO₃
… a four wave mixing setup for the time-resolved femtosecond spectroscopy of Raman-active lattice modes. This setup enables to study the selective excitation of phonon polaritons. These quasi-particles arise from the coupling of electro-magnetic waves and transverse optical lattice modes, the …
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Molecular dynamics studies of the protein bacteriorhodopsin
… longer. The results compare well with recent femtosecond spectroscopy data for these systems and demonstrate that the lifetime of the excited state is controlled by the position and slope of the first potential energy surface crossing point.
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Photoinduced phase transitions studied by femtosecond single-shot spectroscopy
Single-shot femtosecond spectroscopy has been developed and employed for the study of phase transitions of solid-state materials. Using two crossed echelons, a two dimensional spatial delay gradient was generated across a single probe pulse profile. This novel scheme enables us to monitor …
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Photoinduced phase transitions and irreversible dynamics studied with single-shot spectroscopy
Single-shot femtosecond spectroscopy was developed to study irreversible processes and materials far from equilibrium. It was then applied to investigate photoinduced phase transitions in semimetals and manganites. The dual-echelon single-shot instrument was developed, and noise sources, …
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The Photophysics and Transport Properties of Non-Covalent Silicon Phthalocyanine Gold Nanoparticle Conjugates
Nanomedicine has shown great promise for the treatment of a variety of complex diseases including cancer. The use of nanomaterials for non-covalent drug delivery has shown great success in the delivery of photodynamic therapy drugs in animal models, and has great potential as a general delivery …
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Techniques in frequency conversion and time-resolved spectroscopy with nonlinear optical processes in the femtosecond regime
Nichtlineare Frequenzumsetzung der niederenergetischen femtosekunden Laserpulsen wurde in den Festkörpermitteln nachgeforscht. Ramanumwandlung im weiss-Licht-freien Regime des impulsiven stimulierten Raman Streuungs wurde erzielt, indem man KGW-Kristall mit den Bessel-Lichtstrahl pumpte. …
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Charge Carrier Dynamics of Lead Halide Perovskites Probed with Ultrafast Spectroscopy
In this thesis, we investigate the nature of charge carrier generation, relaxation and recombination in a range of lead halide perovskites. We focus on understanding whether the photophysical behaviour of these perovskite materials is like that of highly-ordered inorganic crystalline semiconductors …