Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 72: Ultrakalte Moleküle II (gemeinsam mit MO)
Q 72.5: Vortrag
Freitag, 23. März 2007, 15:15–15:30, 6J
Molecular wavepacket oscillations of ultracold Rb2 — •A. Merli1, S. Weber1, F. Sauer1, M. Plewicki1, F. Weise1, S. Birkner1, L. Wöste1, A. Lindinger1, W. Salzmann2, J. Eng2, T.G. Mullins2, M. Albert2, R. Wester2, and M. Weidemüller2 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D 14195 Berlin — 2Physikalisches Institut, Universität Freiburg, Hermann Herder Str. 3, D 79104 Freiburg i. Br.
Our long-term aim is the efficient formation and vibrational cooling of ultracold Rb2 molecules to their vibrational ground state by pump-dump like processes via an intermediate excited state, theoretical predicted by [1]. First pump-probe experiments with femtosecond light pulses in a dark SPOT magneto-optical trap were successfully performed in order to gain information about the molecular dynamic in the excited state of the Rb-Dimer. The observed wavepacket oscillation periods are depending from the cut-off of the spectral frequencies (made in the Fourier plane of a zero-dispersion compressor) in the pump pulse below the Rb atomic D1 and D2 resonances, respectively. Linear chirps of the excitation pulse influence the pump-probe spectra. Measurements at different bright state fractions [2] of the trapped molecules provide advice about the origin of the molecules which are oscillating.
[1] C. P. Koch, R. Kosloff, and F. Masnou-Seeuws, Phys. Rev . A, 73, 043409, 2006
[2] C.G. Townsend, N.H. Edwards, K.P. Zetie, C.J.Cooper, J. Rink, and C.J Foot, Phys. Rev.A 53, 1702, 1996
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