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MO: Molekülphysik
MO 2: Clusters I: Metal Clusters (joint session A and MO)
MO 2.3: Vortrag
Montag, 2. April 2001, 16:15–16:30, H1012
K*Hen Exciplex Formation on the Surface of Helium Nanodroplets Studied in Real-time — •F. Stienkemeier1, D. Schumacher1, P. Claas1, and C.P. Schulz2 — 1Fakultät für Physik, Universität Bielefeld, Universitätsstr. 25, D-33615 Bielefeld, Germany — 2Max-Born-Institut, Max-Born-Str. 2a, D-12489 Berlin, Germany
Superfluid helium nanodroplets are doped with potassium atoms to form complexes with the alkali atom residing on the surface of the droplets. Dispersed laser-induced fluorescence spectra of such systems already revealed the formation of M*He (M=Na,K) exciplexes upon electronic excitation [1]. By means of femtosecond pump-probe spectroscopy this formation process now is followed in real time. We find K*Hen=1 to be formed within 170 fs. Furthermore, the existence of exciplexes with n > 1 is quantified suggesting the first ring around the potassium atom consisting of 4 helium atoms.
[1] Reho et al., Faraday Discuss. 108, 161 (1997).
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