Frankfurt 2006 – scientific programme
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MO: Molekülphysik
MO 42: Excitation and Coherence Decay
MO 42.7: Talk
Wednesday, March 15, 2006, 15:30–15:45, H12
Quantum interference oscillations of fs-photoionization of heavy alkali-doped Helium nanodroplets — •Marcel Mudrich1, Oliver Bünermann1, Georg Droppelmann2, Patrick Claas2, Claus-Peter Schulz3, and Frank Stienkemeier1 — 1Physikalisches Institut, Universität Freiburg — 2Physikalische Fakultät, Universität Bielefeld — 3Max-Born-Institut, Berlin
Quantum interference (QI) oscillations of the ion yield obtained from fs pump-probe photoionization of K, Rb, and Cs attached to He nanodroplets are recorded. All three heavy alkalis are found to form alkali-helium exciplexes which also show QI [1,2,3]. The observation of QI of RbHe photoionization over tens of picoseconds demonstrates that laser induced coherence persits even when a new molecular bond is formed. Analysis of the QI frequency spectrum allows to determine the vibrational level structure of the exciplex molecule. Moreover, the change in vibrational energies and vibrational cooling can be followed in real time during exciplex formation.
[1] C.P. Schulz, P. Claas and F. Stienkemeier, Phys. Rev. Lett. 87, 153401 (2001)
[2] G. Droppelmann, O. Bünermann, C.P. Schulz, and F. Stienkemeier, Phys. Rev. Lett. 93, 023402 (2004)
[3] O. Bünermann, M. Mudrich, M. Weidemüller, and F. Stienkemeier, J. Chem. Phys. 121, 8880 (2004)