%0 Journal Article
%J Physical Review A
%D 2008
%T Avoided crossings between bound states of ultracold Cesium dimers
%A Jeremy M. Hutson
%A Eite Tiesinga
%A Paul S. Julienne
%X We present an efficient new computational method for calculating the binding energies of the bound states of ultracold alkali-metal dimers in the presence of magnetic fields. The method is based on propagation of coupled differential equations and does not use a basis set for the interatomic distance coordinate. It is much more efficient than the previous method based on a radial basis set and allows many more spin channels to be included. This is particularly important in the vicinity of avoided crossings between bound states. We characterize a number of different avoided crossings in Cs_2 and compare our converged calculations with experimental results. Small but significant discrepancies are observed in both crossing strengths and level positions, especially for levels with l symmetry (rotational angular momentum L=8). The discrepancies should allow the development of improved potential models in the future.
%B Physical Review A
%V 78
%8 2008/11/5
%G eng
%U http://arxiv.org/abs/0806.2583v1
%N 5
%! Phys. Rev. A
%R 10.1103/PhysRevA.78.052703