Tuning the scattering length on the ground triplet state of Cs2
Abstract
We develop two schemes for tuning the scattering length on the ground triplet state of Cs2. First, an absolute value of the triplet scattering length of 133Cs2 is determined using the experimental data (Fioretti et al, Eur.Phys.J. 5, 389 (1999)). We demonstrate that the large scattering length can be made small and positive by coupling of the 3u+ (6S + 6S) potential to the 3g state by strong off-resonant radiation. A weaker laser field coupling the 3u+ (6S + 6S) continuum to the lowest bound level of the excited 3g+ (6S + 6P) also leads to a small positive scattering length. In addition, the scattering length of the 135Cs isotope is found to be positive. The method used solves the Schroedinger equation for two electronic states coupled by an electromagnetic field with approximations employed. The scattering length is determined from calculated continuum wavefunctions of low energy.
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