INFRARED-SPECTROSCOPY AND ENCLOSIVE FLOW COOLING - CONCEPT OF AN INTEGRATED MULTIREFLECTION OPTICS

Molecules with more than four atoms generally exhibit relatively compl ex vibration-rotation spectra at standard conditions. Therefore the as signment of individual spectral lines is often impossible. Furthermore , these molecules are difficult to detect in trace concentrations by a bsorption spectroscopy with tunable diode lasers. A simplification of the spectrum can be achieved by supercooling the gas. For that purpose , the enclosive flow cooling technique was developed which has a very high optical absorption efficiency compared to supersonic jet cooling and proved to be robust and easy to manage. To further enhance the det ection sensitivity of the method, a multireflection optics is integrat ed into the cooling cell. The concept of the advanced cooling cell is presented.