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This thesis focuses on theoretical analysis of the sophisticated ultrafast optical experiments that probe the crucial first few picoseconds of quantum light harvesting, making an important contribution to quantum biology, an exciting new field at the intersection of condensed matter, physical chemistry and biology. It provides new insights into the role of vibrational dynamics during singlet fission of organic pentacene thin films, and targeting the importance of vibrational dynamics in the design of nanoscale organic light harvesting devices, it also develops a new wavelet analysis technique to probe vibronic dynamics in time-resolved nonlinear optical experiments. Lastly, the thesis explores the theory of how non-linear “breather” vibrations are excited and propagate in the disordered nanostructures of photosynthetic proteins.   .

Quantum electrodynamics. --- Picosecond pulses. --- Photosynthesis --- Molecular aspects. --- Picosecond phenomena --- Pulses, Picosecond --- Ultrafast phenomena --- Electrodynamics, Quantum --- QED (Physics) --- Physics. --- Energy harvesting. --- Bioorganic chemistry. --- Atomic structure. --- Molecular structure. --- Spectra. --- Surfaces (Physics). --- Interfaces (Physical sciences). --- Thin films. --- Spectroscopy. --- Microscopy. --- Spectroscopy and Microscopy. --- Biological and Medical Physics, Biophysics. --- Bioorganic Chemistry. --- Energy Harvesting. --- Atomic/Molecular Structure and Spectra. --- Surface and Interface Science, Thin Films. --- Molecular biology --- Laser pulses, Ultrashort --- Quantum field theory --- Schwinger action principle --- Bio-organic chemistry --- Biological organic chemistry --- Biochemistry --- Chemistry, Organic --- Biophysics. --- Biological physics. --- Atomic structure  . --- Molecular structure . --- Films, Thin --- Solid film --- Solid state electronics --- Solids --- Surfaces (Technology) --- Coatings --- Thick films --- Surface chemistry --- Surfaces (Physics) --- Physics --- Structure, Molecular --- Chemical structure --- Structural bioinformatics --- Structure, Atomic --- Atomic theory --- Energy scavenging --- Harvesting, Energy --- Power harvesting --- Force and energy --- Power resources --- Biological physics --- Biology --- Medical sciences --- Analysis, Microscopic --- Light microscopy --- Micrographic analysis --- Microscope and microscopy --- Microscopic analysis --- Optical microscopy --- Optics --- Analysis, Spectrum --- Spectra --- Spectrochemical analysis --- Spectrochemistry --- Spectrometry --- Spectroscopy --- Chemistry, Analytic --- Interferometry --- Radiation --- Wave-motion, Theory of --- Absorption spectra --- Light --- Spectroscope --- Qualitative --- Analytical chemistry

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