Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 13: Posters 3: Cold Molecules, Helium Nano Droplets, and Experimental Techniques

MO 13.40: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Laser photothermal emission spectroscopy of gases — •Felix Axtmann and Johannes Herbst — Fraunhofer IPM, Freiburg, Deutschland

Laser spectroscopy is a selective and sensitive tool for spectral analyzing molecules in the gas phase. Powerful quantum cascade lasers (QCL) enable the application of laser photothermal emission spectroscopy (LPTES). We demonstrate this for a stand off detection of a narrowband and broadband absorber in the gas phase. With LPTES the sample gas is heated up by the QCL using the vibrational rotational transition of the fundamental mode. Detection of the emitted radiation can be performed either by broadband single detectors or infrared cameras. For analyzing the spectral emission we use a Fouriertransform-Infrared spectrometer (FTIR). By the excitation of a single rotational line in the v4 vibrational mode of methane (1306 cm-1) a complete vibrational spectrum is obtained. This research and measurement technique is used for the development of a methane leak detection system.