Metastable Feshbach Molecules in High Rotational States

Details Metastable Feshbach Molecules in High Rotational States Metastable Feshbach Molecules in High Rotational States

2007-10-22

arxiv.org/abs/0710.4052v2

Phys. Rev. Lett. 100, 083002 (2008)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.100.083002

We experimentally demonstrate Cs2 Feshbach molecules well above the dissociation threshold, which are stable against spontaneous decay on the timescale of one second. An optically trapped sample of ultracold dimers is prepared in an l-wave state and magnetically tuned into a region with negative binding energy. The metastable character of these molecules arises from the large centrifugal barrier in combination with negligible coupling to states with low rotational angular momentum. A sharp onset of dissociation with increasing magnetic field is mediated by a crossing with a g-wave dimer state and facilitates dissociation on demand with a well defined energy.

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