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MO: Molekülphysik

MO 15: Ultrakalte Moleküle

MO 15.8: Vortrag

Freitag, 28. März 2003, 15:45–16:00, B 302

Spontaneous alignment of tetracene molecules in ⁴He droplets — •Martina Havenith¹, Nikolas Pörtner¹, and Andrey F. Vilesov² — ¹Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum — ²Department of Chemistry, University of South Carolina, LA, CA 90089, USA

The polarization dependence of the laser induced fluorescence and absorption was investigated for single tetracene molecules embedded in 4 droplets having 4 = 3 · 10³ − 3 · 10⁵ atoms. The measurements revealed an increase in the intensity up to 20 % in the spectra, when the laser polarization vector was aligned parallel to the direction of the droplet beam as compared to the perpendicular alignment. This observation suggests a spontaneous alignment of the molecules in the laboratory frame. A mechanism of the molecular alignment in the pick-up process is proposed.