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Atomic Physics Seminars

ics Atomic
Monday, April 17, 2000
4:00 PM
Physics Building, Room 204
Note special time.
James P. Shaffer [Host: Robert Jones]
The National Research Council, The Steacie Institute for Molecular Sciences, Ottawa, ON, Canada
"Probing Excited States of Ultracold Molecules Using Photoassociative Spectroscopy"
ABSTRACT:
We describe the spectroscopy of highly excited states of ultracold molecules. We use a new photoassociative approach based on resonantly enhanced multiphoton ionization to probe these systems. We excite a large number of rotational states which provides a rich rovibrational spectrum. We are able to use this spectrum to extract not only the first order quadrupole-quadrupole and Van der Waals constants but also sensitive atom-atom interaction parameters such as the spin-spin, spin-orbit, and perturbative constants which arise from interactions between different zeroth order molecular states. This technique also allows information to be obtained about near dissociation collisions. The near dissociation regime is difficult to probe using other techniques.

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