Hannover 2003 – scientific programme
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MO: Molekülphysik
MO 15: Ultrakalte Moleküle
MO 15.8: Talk
Friday, March 28, 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.