|dc.description.abstract||This dissertation focuses on the photodissociation dynamics of stratospheric
bromine and chlorine radical intermediates (BrO, ClO) along with reservoir species
(ClONO2), which are known to play an important role at stratospheric ozone depletion.
The experiments were carried out using a newly built velocity-map ion imaging
apparatus which is an improvement over traditional translational spectroscopy studying
photodissociation dynamics. The apparatus combines a collision-free molecular beam
source with a laser-based pump-probe technique; i.e., single state pumping followed by a
state-selective resonantly enhanced multiphoton ionization. Intense molecular beams
were prepared using a custom-built flash pyrolytic source.
The current research involves the development of fundamental properties of
target species such as bond enthalpies and heats of formation, the chemical identification
of photofragments, and their relative branching ratios, the excited states dynamics that
lead to final products, partitioning of the available energy and finally the wavelength
dependence of all these properties.||