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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1605
DTSTART:20090908T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260417T151639Z
LAST-MODIFIED:20090901T161002Z
LOCATION:5310 Chamberlin
SUMMARY:Observation of ultra long-range Rydberg molecules\, Atomic Phy
 sics Seminar\, Johannes Nipper\, Universitaet Stuttgart\, Germany
DESCRIPTION:At ultralow temperatures highly excited Rydberg atoms can 
 form exotic molecules  bound by a novel binding mechanism.  First prop
 osed by C. Greene and co-workers\, these molecules are bound by low en
 ergy scattering of Rydberg electrons from polarizable ground state ato
 ms. The resulting giant molecules can have an internuclear separation 
 of several thousand Bohr radii\, which places them among the largest k
 nown dimers  to date.<br>
\n<br>
\nHere we report on the experimental 
 observation of the Rb(5S)-Rb(nS) dimer  in a dense cloud of magnetical
 ly trapped Rubidium. The excitation spectra show the ground state and 
 vibrationally excited states as well as trimer states\, where  two gro
 und state atoms are bound to one Rydberg atom in a three body photoass
 ociation process. The measured binding energies coincide with theoreti
 cal calculations taking into account s- and p-wave scattering. Lifetim
 e  measurements for the pure Rydberg state and the molecular dimer sta
 te show a decreased lifetime of the molecular state. Decay channels fo
 r the molecules are discussed. The coherent excitation dynamics of the
  dimer and the Rydberg state are studied in rotary echo experiments.
URL:https://www.physics.wisc.edu/events/?id=1605
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