Berlin 2001 – wissenschaftliches Programm

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MO: Molekülphysik

MO 3: Reactive and Energy Transfer Processes

MO 3.8: Vortrag

Montag, 2. April 2001, 17:30–17:45, H1058

Study of new lithium-containing molecules produced by laser ablation — •Slobodan Milosevic¹, Irena Labazan¹, Eduard Vrbanek¹, and Rudolf Düren² — ¹Institute of Physics, PO Box 304 HR-10000 Zagreb, Croatia — ²Max-Planck-Institut für Strömungsforschung, 37018-Göttingen, Germany

There is a number of lithium-containing molecules that could be of interest for astrophysics or as building blocks of new materials. They are known from ab-initio calculations to be stable but have not jet been observed experimentally. The main goal of our investigation is to specify and optimize the experimental conditions for the formation of such molecules. For this we apply laser ablated plasma which are well know as an excellent environment for molecular ion formation. We use a 308 nm XeCl excimer laser to ablate pure lithium metal or lithium alloy targets, with and without of a buffer gas background (H2, N2, He, Ar). The resulting plume is analyzed by a linear time of flight mass spectrometer varying the plume position versus the TOF axis, laser fluence and the amount of background gas. In certain regions of the plume molecular ions such as LiN+ and LiAr+ are observed. Further confirmation of the observed species will be sought in emission by time resolved fluorescence measurements and in absorption by cavity ringdown spectroscopy.