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Condensed Matter Seminars

ics Condensed Matter
Thursday, April 19, 2001
4:00 PM
Physics Building, Room 204
Note special time.
Note special room.
F. A. Gianturco [Host: V. Celli]
University of Rome
"Molecular impurities in He clusters: microsolvation shells and superfluidity"
The study of unstable chemical species and of fast chemical reactions has profited greatly, in the last few years, from the development improvements of a novel experimental approach, which has been called the helium cluster beam isolation spectroscopy. In this method a beam of clusters, containing from about 103 to about 105 He atoms, picks up in flight one or more atoms or molecules (neutral or ionized) which can then be studied downstream with laser spectroscopy. The corresponding microscopic understanding of the possible structures of the weakly-interacting 4He atoms around or "outside" the molecular impurities requires the treatment of quantum effects on nuclear motions and the selection of the main, dominant structures within each cluster as a function of its size. In the present work we present new results for the quantum structures and the vibrational and rotational shifts for an OCS molecule in 4He clusters using the Diffusion Monte Carlo (DMC) method. A comparison with the recent results [S. Grebenev et al., J. Chem. Phys. 112, 4485 (2000)] from the experimental group in Göttingen will also be reported.

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