报告题目：Spectroscopy of Reactive Chemical Intermediates：Experiment and Theory
报 告 人：Terry A. Miller，Department of Chemistry, Ohio State University
报告时间：2017年4月17日（星期一）， 上午：10:00
报告地点：金沙总站6165地址物理系三楼报告厅C302
报告摘要：Few things affect your quality of life more than the air you breathe and the temperature of your immediate environment. Since more than 80% of the energy used in the industrialized world today is still derived from fossil fuels, these two quantities are not unrelated. Most organic molecules injected into the troposphere are degraded via oxidative processes involving free radical intermediates, and many of these intermediates are the same as the ones involved in the combustion of fossil fuels. Modern spectroscopic techniques like laser induced fluorescence (LIF) and cavity ringdown spectroscopy (CRDS) allow the detection, monitoring, and characterization of chemical intermediates involved in both atmospheric and combustion-related oxidation of organic molecules. Relevant species that we have studied include the alkoxy (RO) and peroxy (RO2) families (R=CnH2n+1) of radicals as well as the nitrate radical NO3. Specifically we will describe results from LIF experiments on the near-UV electronic spectra of CH3O, C2H5O, and i-C3H7O and their analysis. Related CRDS experiments and analyses of the A？-X？ electronic transition in the near-IR of RO2radicals and NO3will be discussed. Both CH3O and NO3are examples of chemical intermediates whose spectroscopy involves one electronic state subject to Jahn-Teller interactions. The spectral effects of Jahn-Teller interactions will be discussed as will the relationship of spectral observations and electronic structure calculations.
