GAS PHASE MICROWAVE SPECTROSCOPY AND INSTRUMENT DEVELOPMENT ON A DOUBLE RESONANCE EXPERIMENT

High resolution rotational spectroscopy is a powerful technique to identify and characterize the accurate structures of volatile, polar and relatively rigid molecules. The first Pulse Beam Fourier transform microwave (FTMW) spectroscopy was constructed by Flygare and Balle in 1981 and provided great improvements in sensitivity and resolution in molecular spectroscopy. The double resonance FTMW spectrometer uses a new method to probe the rotational transitions that share a common quantum state. The linkage information can be used to assign weak transitions. We want to present the current work on hardware and software updates on the instrumentation. The theoretical models such as density functional theory and ab-initio method are used to provide initial estimates for microwave measurement parameters and to help guide transition assignments