Adiabatic and Nonadiabatic Energy Transfer in Cold and Ultracold Collisions

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The proposal tackles some very difficult yet contemporary problems in collision physics.Three-body recombination research will be extended to the heavier alkalis (Na, K,Rb and Cs). A detailed direct comparison of the scattering results when one includes orexcludes nonadiabatic coupling terms and conical intersections will provide new insightsfor interpreting observed phenomena. Study of coherently controlled bimolecularreactions will be extended to include nonadiabatic effects and laser fields. Energydependent cross sections will be calculated over a large energy range from ultracoldenergies to thermal energies. Threshold behavior and quantum resonances will bemapped out. The inclusion of electromagnetic interactions will provide cross sections asa function of laser intensity. The range of laser intensities will be from very weakintensities to intensities of more than 1012 watts/cm3. Photon-system interactions willprovide a rich enviroment for studying chemical reactions especially at ultracold andcold temperatures. Time-dependent methods will be developed to watch the flow ofenergy among different adiabatic states and regions of configuration space.