A variety of problems will be shown which we have been able to approach in the Giessen laboratory using the Bruker IFS 120 HR high resolution interferometer. The species HNCNH has now been fully characterized from its gas phase IR spectrum. Recently we have identified the molecule CNCN, which had not been detected using other analytical and spectroscopic methods. Our high resolution data have yielded the first accurate structure for a well-known species, SCCCS, and direct confirmation of the linear structure of the extended carbon suboxide, OCCCCCO. Further, we have investigated the internal dynamics of SCCCS, OCCCS, OCCCCCO, HSSH, HNCNH and HCNO. The study of the 13C-substituted species of HCNO revealed a novel form of Coriolis resonance.