Reactive Collisions and Interactions of Ultracold Dipolar Atoms
Final rept. 15 Aug 2011-14 Nov 2014
TEMPLE UNIV PHILADELPHIA PA DEPT OF PHYSICS
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We explored Feshbach resonances in the collision between ultracold highly-magnetic dysprosium and erbium atoms. The resonance density is orders of magnitude larger than seen in any other previously studied atomic system. Moreover, we showed that these resonance can only exist because of the anisotropic nature of the atom-atom potentials. Analysis of nearest-neighbor spacings between Feshbach resonances shows a chaotic distribution that one would expect from random-matrix theory. We explained these statistics as originating from the large strength of the anisotropy. We demonstrated that the vibrational motion of BaCl molecules is quenched by collisions with ultracold calcium atoms at a rate comparable to the Langevin rate. This is over four orders of magnitude more efficient than traditional sympathetic cooling schemes. In addition, we calculated the electronic structure of BaCl and other molecular ions. Based on these results we found unusually-large rates for cold charge-transfer reactions between neutral and ionic atoms.
- Electricity and Magnetism
- Atomic and Molecular Physics and Spectroscopy
- Particle Accelerators