Possible Techniques: FTIR: Fourier Transform Infrared Spectroscopy: Measurement of basic and trace gas components until ppm range (for example H2O, CO2, CO, H2S ). Polar Molecules are necessary. Raman-Spectroscopy: Measurement of basic gas components. Also not polar molecules like H2 or N2 are measurable. ELIF: Excimer Laser induced Fragmentation Fluorescence: UV-Laser-based Method of Measuring of gaseous alkaline compounds (for example NaCI, NaOH, KCI, KOH). Also at 193 nm an entry through UV_Saphire is possible.