The Laser Spectroscopic Laboratory of Reactive Intermediate applies laser spectroscopic techniques to study the molecular geometries and photochemistry of reactive intermediates such as small free radicals, cations and Rydberg molecules with high principal quantum numbers, particularly those pertinent to combustion chemistry and interstellar chemistry. These labile transient species are difficult to prepare, purify and isolate from the precursor and other molecules. Thus, knowledge of them is relatively scarce.
　　Recent advances in the molecular beam technique and laser spectroscopic technique allow us to detect and study them. The spectroscopic techniques we have currently employed are photofragment excitation spectroscopy, laser-induced fluorescence (LIF), multi-photon ionization spectroscopy (MPI) and pulsed-field-induced-zero-kinetic-energy-photoelectron spectroscopy (PFI-ZEKE photoelectron spectroscopy).
　　Projects currently underway in the Laboratory are (1) effects determining the spectral intensity of the 1+1' two-color PFI-ZEKE photoelectron spectroscopy of acetylene, (2) elucidation of the Renner-Teller effects of both the cis- and trans- bending vibration motion of acetylene cation using 1+1' two-color PFI-ZEKE photoelectron spectroscopy, and (3) investigation of the 193 nm photolysis products of propyne using laser-induced fluorescence.