Imaging studies of photochemistry of the stratospheric bromine and chlorine compounds

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Title: Imaging studies of photochemistry of the stratospheric bromine and chlorine compounds
Author: Kim, Hahkjoon
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 .
URI: http : / /hdl .handle .net /1969 .1 /3726
Date: 2006-08-16

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Imaging studies of photochemistry of the stratospheric bromine and chlorine compounds. Available electronically from http : / /hdl .handle .net /1969 .1 /3726 .

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