Darmstadt 2008 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 19: Kalte Moleküle III [gemeinsam mit MO]

Q 19.8: Talk

Tuesday, March 11, 2008, 15:45–16:00, 3G

Molecular Spectroscopy in Superfluid Helium Nanodroplets Created in a Pulsed Even-Lavie Nozzle — •Dominik Pentlehner and Alkwin Slenczka — Universität Regensburg, Institut für Physikalische und Theoretische Chemie, 93053 Regensburg, Germany

Pulsed molecular beam sources provide enhanced particle density while the average flux of gas is reduced. Therefore, molecular spectroscopy with pulsed lasers provides a better signal to noise ratio in a pulsed molecular beam than obtained in a continuous beam. One of the most reliable pulsed molecular beam sources developed by U. Even and N. Lavie [1] was tested at low temperatures to produce a pulsed beam of superfluid helium droplets. By the observation of Rayleigh scattering and laser induced fluorescence the pulsed droplet source was characterized. The reliability of the Even-Lavie nozzle as helium droplet source appears to be excellent for repetition rates below 30 Hz. The fluorescence excitation spectra of organic molecules doped into the droplets generated in the pulsed nozzle expansion will be presented.

[1] U. Even, J. Jortner, D. Noy, and N. Lavie, C. Cossart-Magos, J. Chem. Phys. 112 (2000), 8068.