Dresden 2011 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 35: Spectroscopy in He Droplets
MO 35.5: Vortrag
Freitag, 18. März 2011, 11:30–11:45, MER 02
Rotational constants of molecules in small Helium droplets — •Andreas Przystawik1, Andreas Kickermann1, Lasse Schroedter1, Marion Harmand1, Stefan Düsterer1, Harald Redlin1, Sven Toleikis1, Andrew Ellis2, Robert Zillich3, Marius Lewerenz4, Klaus von Haeften2, and Tim Laarmann1 — 1Deutsches Elektronensynchrotron (DESY) Photon Science, Hamburg, Germany — 2University of Leicester, UK — 3Johannes-Kepler-Universität, Linz, Austria — 4Université Paris Est, Marne-la-Vallée, France
Molecular spectroscopy in Helium droplets has developed into a tool for studying the vibrational and rotational motion at sub-Kelvin temperatures and thereby greatly simplifying the analysis and understanding of the investigated molecules. The superfluid nature of the droplets enable to observe the nearly undisturbed rotation of a molecule. On the other side superfluidity is a macroscopic property. That means finite size effects and details of the interaction between the molecule and the inner Helium solvation layers affect the rotational constants. Considerable efforts were taken to measure this perturbation [1,2].
Here, we will present a new experimental approach to this topic that may enable a simpler assessment of the droplet size dependent rotational constants for small droplets. First data on CO in small Helium clusters chosen as a model system will be discussed.
[1] L.A. Surin et al., Phys. Rev. Lett. 101, 233401 (2008)
[2] R.E. Zillich, K.B. Whaley, K. v.Haeften, JCP 128, 094303 (2008)