Interactions and dynamics in Li+Li2 ultracold collisions.

Deviation from universality in collisions of ultracold 6Li2 molecules.

Collisions of 6Li2 molecules with free 6Li atoms reveal a striking deviation from universal predictions based on long-range van der Waals interactions. Li2 closed-channel molecules are formed in the highest vibrational state near a narrow Feshbach resonance and decay via two-body collisions with Li2, Li, and Na. For Li2 + Li2 and Li2 + Na, the decay rates agree with the universal predictions of...

Ultracold collisions between Li atoms and Li2 diatoms in high vibrational states

Ultracold Molecules from Ultracold Atoms: Interactions in Sodium and Lithium Gas

The thesis presents results from experiments in which ultracold Sodium-6 and Lithium-23 atomic gases were studied near a Feshbach resonance at high magnetic fields. The enhanced interactions between atoms in the presence of a molecular state enhance collisions, leading to inelastic decay and loss, many-body dynamics, novel quantum phases, and molecule formation. Experimental data is presented a...

Photoassociative spectroscopy of long-range states of ultracold 6 Li2 and 7 Li2

We have obtained spectra of the high-lying vibrational levels of the ASu 1 and 1Sg states of both Li2 and Li2 via photoassociation of colliding ultracold atoms confined to a magneto-optical trap. Because of the low collision energies (;1 mK!, very high spectroscopic resolution is realized, and sensitivity is greatest for the usually difficult to access long-range states. Binding energies relati...

Dynamics of Low Velocity, Rovibrationally Inelastic Li2-Rare Gas Collisions

This thesis presents a study of the dynamics of trajectory calculations at low velocity utilizing potentials for the Li