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SUMMARY:When molecular physics meets ultracold gases - Olivier Dulieu (CNR
 S Paris)
DTSTART:20100719T143000Z
DTEND:20100719T160000Z
UID:TALK25595@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:The rapid development of experimental techniques to produce co
 ld and ultra-cold molecules opens the ways to manipulate them or to contro
 l their formation dy-namics using external fields\, and to explore their i
 nteractions with surrounding par-ticles. In most cases\, the detailed know
 ledge of the internal molecular structure is re-quired to guide such studi
 es and to interpret their results. For several years now our group carries
  out systematic theoretical investigations on alkali molecular systems\, u
 sing a quantum chemistry approach based on pseudopotentials for atomic cor
 e rep-resentation\, Gaussian basis sets\, and effective potentials for cor
 e polarization. Poten-tial curves\, permanent and transition dipole moment
 s\, and static dipole polarizabili-ties have been obtained for all alkali 
 pairs\, both homonuclear and heteronuclear\, which are relevant for ultrac
 old molecule formation processes. \nRecent extensions of these studies con
 cern the computation of dynamical po-larizabilities of bialkali molecules\
 , which determine the ability for trapping them in optical lattices during
  the manipulation of their internal degrees of freedom. Once these molecul
 es are brought into the lowest level of their ground state\, we further an
 alyze the competition between their hyperfine structure and the quadratic 
 Stark shifts induced by the optical lattice.\nMolecules composed of an alk
 ali atom and an alkaline-earth ion (or an Yb+ ion) may also be modelled as
  effective two-electron systems that we recently addressed with our approa
 ch. Preliminary results will be presented for such compounds\, in the pers
 pective of the possibility to observe charge exchange process when a cold 
 atom trap is set up together with a cold ion trap.\nThis work is achieved 
 in collaboration with Corentin Pavageau\, Romain Vex-iau\, Mireille Aymar\
 , and Nadia Bouloufa.\n\n
LOCATION:Rutherford building\, Seminar Room B
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