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UP: Fachverband Umweltphysik
UP 10: Poster: Umweltphysik
UP 10.3: Poster
Thursday, March 5, 2009, 17:48–19:00, VMP 9 Poster
Concentrated atmospheric nanoparticle beams in vacuum for X-ray and optical spectroscopy. — •Jan Meinen1,2, Svetlana Khasminskaya1, and Thomas Leisner1,2 — 1Institute for Meteorology and Climate Research, Aerosols and Heterogeneous Chemistry in the Atmosphere (IMK-AAF), Forschungszentrum Karlsruhe GmbH, Germany — 2Institut for Environmental Physics (IUP), Atmosphere and Remote Sensing, Ruprecht-Karls-Universität Heidelberg, Germany
The IPCC AR4 points out the important role of aerosol in the radiation budget of the earth. In the model prediction, direct and indirect contribution of the atmospheric aerosol causes a net cooling of the earth. Understanding the fundamental physical and chemical processes of heterogeneous nucleation of water on nanoparticles could help improving the models.
Here we present the first stage of the TRAPS apparatus (Trapped Reactive Atmospheric Particle Spectrometer) consists of a nanoparticle source, an aerodynamic lens and differential pumping system, a linear ion trap with driving electronics and particle detectors. This assembly is capable to inject nanoparticles into vacuum chambers in a highly efficient way. The dilution of the particle number concentration arising from the gas expansion from room pressure into vacuum is compensated by concentrating the particles in a small cylindrical volume by electrodynamic trapping. The enlargement of the target density compared to a free molecular beam provides a tool for various techniques of spectroscopy used on smaller ions by routine.