A. V. Avdeenkov

Linking Ultracold Polar Molecules

We predict that pairs of polar molecules can be weakly bound together in an ultracold environment, provided that a dc electric field is present. The field that links the molecules together also strongly influences the basic properties of the resulting dimer, such as its binding energy and predissociation lifetime. Because of their long-range character, these dimers will be useful in disentangling cold collision dynamics of polar molecules. As an example, we estimate the microwave photoassociation yield for OH-OH cold collisions.

Collisional dynamics of ultracold OH molecules in an electrostatic field

Ultracold collisions of polar OH molecules are considered in the presence of an electrostatic field. The field exerts a strong influence on both elastic and state-changing inelastic collision rate constants, leading to clear experimental signatures that should help disentangle the theory of cold molecule collisions. Based on the collision rates, we discuss the prospects for evaporative cooling of electrostatically trapped OH. We also find that the scattering properties at ultralow temperatures prove to be remarkably independent of the details of the short-range interaction, owing to avoided crossings in the long-range adiabatic potential curves. The behavior of the scattering rate constants is qualitatively understood in terms of a novel set of long-range states of the [OH]{sub 2} dimer.

Ultracold collisions of oxygen molecules

Collision cross sections and rate constants between two ground- state oxygen molecules are investigated theoretically at translational energies below

Field-linked states of ultracold polar molecules

sim 1

Ultracold collisions of fermionic OD radicals

K and in zero magnetic field. We present calculations for elastic and spin- changing inelastic collision rates for different isotopic combinations of oxygen atoms as a prelude to understanding their collisional stability in ultracold magnetic traps. A numerical analysis has been made in the framework of a rigid- rotor model that accounts fully for the singlet, triplet, and quintet potential energy surfaces in this system. The results offer insights into the effectiveness of evaporative cooling and the properties of molecular Bose- Einstein condensates, as well as estimates of collisional lifetimes in magnetic traps. Specifically,

Pair wave functions in atomic Fermi condensates

^{17}O_{2}

Bose-Fermi mixtures near an interspecies Feshbach resonance: testing a non-equilibrium approach

looks like a good candidate for ultracold studies, while

Field-Linked States in Ultracold Molecular Collisions

^{16}O_{2}

Generalized Mean Field Theory of Resonant Bose-Fermi Mixtures.

is unlikely to survive evaporative cooling. Since

Bose-Fermi Mixtures Near an Interspecies Feshbach Resonance: A Non Equilibrium Analysis

^{17}O_{2}