Düsseldorf 2007 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 65: Ultracold Molecules II (gemeinsam mit Q)

MO 65.5: 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