THE TRIPLET STATE

Antoine B. Zahlan

Ravinder Kachru

Sun Jin-Feng, Du Bing-Ge, Zhang Ji-Cai +2 more

The elastic scattering properties of ultracold 133Cs2 triplet state are investigated in detail. We construct a potential curve of the 133Cs2 triplet state, based on the latest ab initio molecular potential data and show how the scattering parameters are obtained by using three methods: the Numerov method, the semiclassical method and the variable phase method, where the scattering lengths of the 133Cs2 triplet state, i.e. 301.79a0, 300.67a0 and 310.81a0 are obtained respectively, with a0 being the Bohr radius. We also calculate the effective range and the number of bound states for the 133Cs2 triplet state. Our results are in agreement with the recent experimental data and the theoretical calculations. This confirms that the results of the scattering properties of the ultracold 133Cs2 triplet state, calculated by using these three methods, are reliable.

Christopher A. Hunter, Michael J. Krische

Christoph Strauß

In this thesis I report precision spectroscopy with ultracold 87Rb2 triplet molecules where we use lasers to couple the states in different molecular potentials. We study in detail the lowest triplet states of Rb2. These states are of great importance for transferring weakly bound molecules to the ro-vibrational triplet ground state via states of the excited potential. As most experiments start from molecules in their singlet ground state, the triplet states were hard to access via dipole transitions and remained largely unexplored. The measurements presented in this thesis are the first detailed study of diatomic 87Rb2 molecules in these states.

Arthur Rose-Innes, E. H. Rhoderick