Ultrafast measurements of chlorine dioxide photochemistry

摘要

Time-resolved mass spectrometry and time-resolved photoelectron spectroscopy are used to study the ultrafast photodissociation dynamics of chlorine dioxide, an important constituent in stratospheric ozone depletion. Chapter 1 introduces these pump/probe techniques, in which a femtosecond pump pulse excites a molecule to a dissociative state. Chapter 2 includes a detailed description of the design and construction of the experimental apparatus, which consists of a femtosecond laser system, a molecular beam time-of-flight spectrometer, and a data acquisition system. The results of the time-resolved mass spectrometry experiments of chlorine dioxide are presented in Chapter 3. Chapter 4 presents the results of the time-resolved photoelectron experiments of chlorine dioxide. Conclusions of the mass and photoelectron results are discussed in context of the stratospheric ozone depletion problem.