The Chemical Dynamics and Spectroscopy Group consists of 6 principal investigators and 2 adjunct research fellows. The research objectives of this group are to provide a better understanding of (1) the structure and chemical behaviors of highly reactive polyatomic radicals and transient species, (2) the microscopic details of the mechanisms and dynamics of elementary chemical reactions and primary photodissociation processes, and (3) the applications of the above in complicated systems, like atmospheric chemistry, MALDI, and carbohydrate mass spectrometry.
Short-lived Criegee intermediates play an important role in atmospheric chemistry. Jim Jr-Min Lin is studying the spectroscopy and reaction kinetics of Criegee intermediates at near atmospheric conditions by using transient absorption technique. Chi-Kung Ni investigates the dissociation mechanism of carbohydrates and develops a simple and rapid method for de novo structural determination of oligosaccharide. Yuan Tseh Lee and Chi-Kung Ni used various ion imaging and crossed molecular beam technologies to investigate the mechanism of matrix-assisted laser desorption ionization and proposed a thermally induced proton transfer model to explain the ion generation. Kaito Takahashi's research interest is to understand anion hydration as well as to clarify aspects that determine gas phase chemical reactions. Recently, he has been calculating the reactivity of Criegee intermediates to understand its atmospheric relevance. Pei-Ling Luo is interested in gas sensing, laser spectroscopy and investigation of important species in atmospheric chemistry with broadband laser sources. Jer-Lai Kuo's group uses theoretical and computational tools to investigate the structure and properties of molecular crystals and 2D materials.
Wen-Bih Tzeng applies the two-color resonant two-photon ionization and mass-analyzed threshold ionization techniques to study various isomers of multiply substituted benzenes and some organometallic sandwich molecules. New information about the electronically excited species and cations are obtained.