Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 15: Cooling and Trapping IV (joint session A and Q)
A 15.1: Vortrag
Donnerstag, 5. April 2001, 15:45–16:00, H104
Sympathetic Cooling of 85Rb and 87Rb — •I. Bloch1,2, M. Greiner1,2, O. Mandel1,2, T. W. Hänsch1,2, and T. Esslinger1,2 — 1Max-Planck-Institut für Quantenoptik, D-85748 Garching — 2Ludwig-Maximilians-Universität, Schellingstraße 4/III, D-80799 München
We demonstrate sympathetic cooling between magnetically trapped 85Rb and 87Rb atoms. Up to 6×106 85Rb atoms are cooled via elastic collisions with a reservoir of 8×108 87Rb atoms. The temperature of the binary atomic ensemble is adjusted by using radio-frequency evaporation of 87Rb. Temperatures as low as T=100 nK have been realized in the binary ensemble. Through a cross-dimensional mixing approach we have been able to measure the interspecies 87Rb-85Rb scattering cross section. Mixtures of degenerate boson-boson quantum gases of different atomic species seem now within experimental reach. The rubidium isotope mixture promises to be an especially interesting case for studies of interacting mixed species Bose-Einstein condensates due to the adjustable interactions in this system.