Experimental investigation of the dynamics of S1 benzene and the development of a new UV femtosecond pulse shaper.
Doctoral thesis, UCL (University College London).
Experimental work into the molecular dynamics of excited state benzene and the development of a new ultraviolet pulse shaper are presented. The non adiabatic non radiative decay process of benzene in its first excited has been determined using pump probe time resolved photoelectron spectroscopy. An ultrafast oscillation has been found at the onset of the channel 3 region which is attributed to intersystem crossing. Our experimental findings contribute to theoretical observations of a higher than previously expected spin orbit coupling in organic polyatomic molecules. The concluding mechanism is mediated by a doorway state and is supported by quantum dynamics simulations. A pulse shaping capability has been developed to shape the output of a commercial optical parametric amplifier in the visible region using a reflective mode, folded, pulse shaping assembly employing a spatial light modulator. Second harmonic generation is used to frequency double the shaped visible pulse down to the deep ultraviolet energy region. A variety of pulse shapes have been synthesised and characterised using cross-correlation frequency resolved optical gating. The pulse shaping set-up benefits from wavelength tuneability allowing for its application to a range of coherent control schemes.
|Title:||Experimental investigation of the dynamics of S1 benzene and the development of a new UV femtosecond pulse shaper|
|Open access status:||An open access version is available from UCL Discovery|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry|
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